dino detectives (3-20 minute .stations) 'theories" * ho\v do \ve

$: Dino Detectives (3-20 Minute .Stations) 'Theories" * Ho\v Do \Ve$
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Dino Detectives (3-20 minute . stations)

'Theories" * Ho\v do \ve know dinos ever existed? * \Vhat can we learn from fossils? What vvill \ve never be able to knO\V from fossils? * How do fossils fann? What makes a fossil? eggs, bones, teeth, skin, shells, footprints * \Vhy are all the dinosaurs gone? Are they really extinct?

o RNITHISCHIAN = bird -hipped herbivores

/ Ornithopods = bird-footed e.x: Parasaurolophus

Ceratopsians = horned/beaked dinos ex: Protoceratops and Triceratops

annored dinos Pachycephalosaurus -(thick-headed) Stegosaurus -(annar-plated)

· .. · .. · .. ····· ... ·· .. ·/tJ:RiSc~~~pped·ai'iiOsaurs ...................... .

CARNIVORES HERBIVORES Therapods = Sauropods = wild-beast footed reptile-footed e.x:: Dilophosaurus ex: ApatosaU11.LS and Velocirc;zptor and T. Rex

"Fossil Dig" Dig for fossils in sand pit --- talk about paleontologists, tools used in fossil digs, museums --- fossils found in Austin: icthyosaur and plesiosaur, cephalopods, gastropods, exogyra, graphea, echinoids, mastodons, prehistoric turtles, but NO DINOSAURS!!! Why? Austin was under the ocean at the time dinosaurs lived --- research still happening today --- bury again at end for next class

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PROGRAM DESCRIPTION: DINOSAURS

Part I Basis for program Title: Dinosaur Detectives Course Description: Search· for dinosaur tracks while gathering clues

about the creatures that made them .. Dig for bones like a paleontologist and create a story about your favorite beast.

Age Level: preK- grade 2 Time: 1 hour Goal: Participants will learn about the characteristics of dinosaurs and the

uncertainty of existing theories.

Part II Instructional Plan Course Outline: Two 30 minute sessions:

1 st: Program box---dino relics to learn physical characteristics. life strategies and defenses.

2nd: Fossil hunt---follow tracks to fossil pit and dig for fossils. (Rain plan: bubble in classroom)

Part III Resource Support Site Needs: 1 clas·sroom and sand pit (good weatn.er), 2 class looms (bad). Participant Thresholds: up to 30 students with 2 instructors. . Transportation Needs: Outreach would require use of rain plan, also ta~es

extra time to set up. 'Resource Needs: Dina program box

Dina egg nest Bones to bury and digging equip .

. Laminated tracks -Dina poster Dinosaur graph with die cut npeople"

. tnt ~ fp'rst ~ "n1rUU~. 1'c« .I..Idt ~tI ~/YJ ~f)1.f '1 tAL f'Y1i)c/lA'-<. Into a d"n~,. lihAf-'. Atld eyes, ~~ ~ to ~ ~ p!\L -ktA~ iJtIA Izu 'I· eM· '

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PROGRAM SCRIPT: DINOSAURS

First Station: Dinosaurs were a special group of animals that lived during the Mesozoic

Era, which lasted for almost 180 million years. How d,o we know they existed? Scientists have found their remains: bones,

eggs, tracks, coprolite (fossifized feces), nest, 'skin impressions, and gastroliths (stomach stones). '

Show a bone from a known animal. Don't tell them what the bone is from. Imagine,that you are a paleontologist and you come across the bone. From only this information I can you tell me what this animal was, where it lived, what it ate and what color it was? How about how it raised its young or protected itself? These are the questions scientists must answer from only fossil records. Because the :. information is limited, theories on dinosaurs are constantly being revised.. Because we can not go back in time to see and study dinosaurs, our information wiJI always be theories. This can be very exciting because it means that maybe one of you in the future may find evidence that unlocks the answers to some of the baffling questions about dinosaurs like how they died.

Let',s look a1 what evidence has been discovered. Bones:, The first dinosaur bone was discovered in 1822 by Mary

Ann Mantell in England. She found an Iguanodon tooth which she gave to her husband, a scientist. It was not until 1841 that another ,English paleontologist, Richard Owen invented the word-dinosaurto describe the extinct animals whose fossilized bones they were finding. The word dinosaur means "terrible IizardD

•

Size: How big were dinosaurs? From excavated bones, dinosaur skeletons haye been assembled. They give us a more accurate record of the size and kinds of dinosaurs.

For example: - Height Length Com psognathus 1 foot 2 feet Tyrannosaurus 43 ft. 50 ft. Triceratops 30 ft. 25 ft. Diplodocus 90 ft. 100 ft. Velociraptor 4 feet 6 feet (For comparison: a small car weighs about 1 ton. )

Weight

, 7 tons 6 tons 13 tons

, Let1s get an idea of how big a Tyrannosaurus was? Measure 40 feet on the g~ound with a tape measure. Have the children lay head to toe until they reach 40 feet. How many children, did it take? Show children a poster-size graph of the relative sizes of a few of the dinosaurs.

What color were dinosaurs? What texture was their skin? Show samples of simulation dina skin. Discuss various colors in nature and show a short slide show or pictures of variety"of colors that exist.. Examples: Painted bunting, c;ollared lizard, alligator monitor, poison arrow frogs, zebra. Could dinosaurs have been tho~e strange colors?

WhC\t did dinosaurs eat? We can tell by looking at their teeth." Show a Tyrannosaurus tooth as an example of a carnivore. Tyrannosaurus had 60 I~rge curved back teeth. The teeth were very sharp and had razor-like edges like a stake knife. They were perfect for stabbing and slicing through flesh. Contrast Tyrano vs. ~tegosaurus, an herbivore. Stegosaurus had a turtle-like beaked mouth to chop soft vegetation, then it ground the food with small weak teeth in the back of its mouth. Show a turtle skull for comparison.

o~_oo_,- 0-

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DINO-Prog Script continued

U Dinos and their young: Paleontologists think most dinosaurs hatched

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from eggs. Many dino eggs have been found. Surprisingly, even the giant dino's eggs are relatively small. Dinosaur eggs were only bout 12 inches around because an egg larger than that would have had to be too thick to support the weight of the brooding parent. Thick egg shells would not allow oxygen to reach the baby inside and consequently it would die. Dinosaur nests have been dug up in Montana and other parts of the world. These nests resemble modem crocodile and marine turtle nests. The fossilized eggs are clustered.in piles of sand and mUd. It is thought that the females dug the nest with the claws on their hind feet. Some nests found in France are over 15 feet wide. There ;s also evidence that some dinosaurs cared for their young much the way birds do today. Food may have been brought back to the nest for the young.

How did they die? Sixty-five million years ago dinosaurs became extinct. How and why did they die? No one really knows for sure, but there are many theories. See note cards.

Activity: You are all paleontologists on a great dinosaur fossil hunt. You have

discovered the bones in front of you. Try to put them together the way you think they were inside a living dinosaur. Glue the bones on a piece of paper. (Bones are packing peanuts or shapes of ~hite paper.)

Second Station: Before your group arrives, hideo bones in the sand pit and place laminated

-footprints from the meeting place to the pit. Tell children today you will be "Dinosaur Detectivesn

• There have been stories that dinosaur bones may have been found on the site. You will follow the tracks to the pit. Read the clues on the tracks to find out which dinosaur you are tracking. This keeps the group more ° focused on learning.

Indoor Option for rainy days: Tell the kids you are traveling back though time to the days of the dinosaurs. Enter the environmental bubble. Take a moment to settle. listen to the tape. Read the clues and have kids guess which din you are talking about.

REFERENCES: A Field Guide to the Dinosaurs, David Lambert, Avon Books 1983. The Big Beast Book. °Dinosaurs and How They Got That Way. Jerry Booth, Little

Brown & Co. 1988. Nature Scope - Digging Into Dinosaurs, National Wildlife Federation 1988. Dinosaurs, Rick Gore, National Geographic Vol. 183, No.1, Januaryo1993.

Dino Detectives U

Classification Station

Tape recorder

Dino sound tape

Plastic Parasaurolophus (3)

Picture ofParasaurolophus

Duckbill tooth row (in green bag)

Plastic Pachycephalosaurus

Picture of Stegoceras

Plastic Ankylosaurus (small)

Picture of Ankylosaurus

Plastic Triceratops

Picture of Triceratops

Triceratops hom core (in green bag)

Plastic Stegosaurus

Picture of Stegosaurus

Stegosaurus Plate (in green bag)

Stegosaurus spike (in green bag)

Camptesaurus hand bones (in green bag)

Laminated picture of Camptesaurus

Plastic Apatosaurus (Brontosaurus) (large)

Picture of Apatosaurus

(OVER)

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Plastic Brachiosaurus

Picture of Brachiosaurus

Allosaurus claw (in green bag)

Picture of Allosaurus

Nanasaurus skull profile (in green bag)

Plastic Tyrannosaurus Rex

Picture of Tyrannosaurus Rex

Tyrannosaurus Rex tooth (in green bag)

Tyrannosaurus Rex brain case (in green bag)

Tyrannosaurus Rex front claw and phalange (in green bag)

Dino Detectives

Theories Station

Large imprint of foot

Cow bone

Real dino fossil

Duckbill skin replica (in green bag)

Protoceratops egg (in green bag)

Ziploc bag of small dino skull replicas

Plastic egg with baby parasaurolophus hatching out

Plastic Maiasaura

Picture ofMaiasaura

Plastic Maiasaura with babies

u Plastic Apatosaurus (small, green)

Plastic Pterariodon

Plastic Plesiosaur

Plastic DemitridonJEdaphosaurus (red and yellow)

Laminated pictures ofDino becoming a fossil (4)

Laminated picture of dino eggs spread out on floor

Laminated picture of Model of Fossil Embryo with Hand

Laminated picture of Model reproduction of Fossil Embryo

Laminated picture of Bone Comparison

Dino herd problem solving box

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Austin Nature and Science Center

Paleo Explorers Program

Time Line and Dino-Dino Not Game Station:

Time Line Activity

Where: Time Needed: Materials:

Arbor near Entrance to'Dino Pit /Rainy Day-do inside 15 minutes Time line activity, dinosaur models, present day creature models, Texas geologic highway map

Paleo Explorers Concepts:

Station Concepts:

Procedure:

*Participants study about the past to learn about the present

*Students begin to understand the concept of geologic time. Students actively place events in order of occurrence on time line

"* Students learn characteristics of dinosaurs and other prehistoric creatures

See attached "The Sands of Time" lesson

DinolDino Not Game

Where: Time Needed: Materials:

Arbor near Entrance to Dino Pit 15 minutes DinolDino Not cards, pictures and models of dinosaurs and other prehistoric creatures, Life on Earth poster

. Paleo Explorers Concepts:

Procedure:

*Participants learn characteristics of dinosaurs and how to distinguish dinosaurs from other prehistoric creatures.

See attached DinolDino Not lesson

Lesson #3 The Austin Nature and Science Center Pre-Historic Paleontology Kit

The Sands of TIme • l-esso'ns #3, 4 and 5 ore -designed to build up knowledge helping

students better understand ihenext activity. Do these activIties in order

This activity helps students understand the immense amount of time that passed before we walked on the Earth. This lesson will also help students

understand the connection between human appearance on Earth relative to the development of other animals and plants.

Materials: (Materials provided unless noted otherwise) • Multi-colore'd beaded time line • Time Line activity cards (in the bag with the beaded time line) • A laminated sheet titled "Geologic Time Scale" (bagged with the

time line)

Procedure: 1) Have two students hold each end of the time line or tie it

someplace in your classroom so that the time line is outstretched

2) Explain that the earth was formed right before the first blue bead. Present day is at the other end, represented by a very small white bead. Each bead represents approximately 10 million years with the exception of the very small white bead, which represents 1.8 million years. Each gold t:>ead represents a break or end of each

, time period. Each group of colored beads represents an epoch.

3) The "Time Line Activity Cards" represent some important events in Earth history. Have your students place each time Jine card on the time line where they think that event would have taken place. They can use educated guessing/hypothesizing for this activity. The time line helps students understand the immense amount of time that has passed before humans walked on the Earth.

After they have finished placing their activity cards on the time line, move the time line cards to their proper place in Earth history. Consult the sheet included in the time line activity bag titled "The Geologic Time Scale" to help find the correct place in time to place them. liThe Geologic Time Scale" sheet shows the Earth history represented by dots. Each dot represents one million years (instead of each bead representing 10 million years as is shown in the time line provided). The events on the time line activity cards correspond to some of the events represented by red letters or numbers interspersed within the dots on this sheet. Each time line activity card also has letters or numbers in parenthesis that correspond directly to liThe Geologic Time Scale" sheet to make it easier to look up where that organism belongs in time.

• This less·:)n was adapted from a lesson created by the Indiana and Kentucky Geologic Survey

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Lesson #2 The Austin Nature and Science Center Pre-historic Paleontology Kit

Dlno or Dino Not? Students will observe, classify, question and use logic to learn that all

prehistoric animals were not dinosaurs. Students will be able to distinguish between. dinosaurs and other prehistoric animals.

Materials: (Materials are laminated & found in one clear plastic envelope)

.• IIWhat's a Dinosaur?" (laminated white 8 1/2" x 11" paper) • Set of pre-historic animal description sheets about each "Dina or

Dina Not?" {laminated white 8 1 /2"xl1" paper) • Set of brightly colored "Dina or Dina-Not?" cards (laminated)

Procedure:

IIWhat makes a dinosaur a dinosaur?" is often asked. Paleontologists have determined that there are four "rules" we can use to "test" a dinosaur. By using these rules and the "Dina or Dina Not?" cards, you can work with the students (or have them work together) to separate dinosaurs from the other, well-known prehistoric animals. The "Dina or Dina Not?" cards can be used to test the knowledge of your students and to teach them the rules of what determines a dinosaur.

1) Engage the students in a simple discussion of the four rules of what determines a dinosaur. While explaining the rules, show your students the "Dina or Dino Not?" card or animal that would best demonstrate the rule. Below are the rules and an appropriate animal to help explain each rule.

Rules: vY"l Rule l-Dinosaurs did sst live during the Mesozoic Era ,ttike the Mastodon) Rule 2-Dinosaurs walked fully erect and had their legs under their body (unlike the Dimentrodon who has his legs to the side of his body) Rule 3-Dinosaurs lived on land. They did not have wings (like the Pteranodon) or flippers (like the Mosasaurus )

*It is rule 4 and only rule 4 that makes an animal a dinosaur. Rules 1 through 3 ar~ only interpretations based on animals that qualify as dinosaurs under rule 4. Rules 1-3 are easier to use with your students.

Rule 4 - the unique features that define dinosaurs are: a) Three or more fused sacral vertebrae (there are at least three

vertebrae to which the hips are attached). b) The scapula is long and strap-like (the shoulder blade is ot least

three times as long as it is wide). c) The glenoid faces backward (the shoulder socket faces the rear of

the onirrlol)

Lesson =#2 The Austin Nature and Science Center Pre-historic Pale'Ont'Ol'Ogy Kit

d) The acetabulum is fully 'Open (the hip socket has a hole through it). e) The head 'Of the femur is bent inward, yvith a distinct head .and neck

(the top 'Of ihe femur is ball-shaped with a narrow neck attaching it at an angle te the rest 'Of the femur).

f) The f~mur is usually sherter than the tibia. g) The fibula is greatly reduced (the fibula is very small cempared te

the tibia). h} The ascending.precess 'Of the astragaJs is well develeped (e!1e 'Of

the ankle bones develeps a projection which extends onto the tibia). (See the labeled Dinesaur Skeleten on page 33)

2) Using the "Dine 'Or Dine-Not?" cards and rule sheet, have your students determine which 'Of the animals en the "Dirie or Dine Net?" cards are dinesaurs and which 'Ones are pre-histeric animals that are net dinosaurs. This can be done as a class assignment 'Or as a smallgreup preject. The cards can alse be' used as an individual preject or fer self-testing.

*/nfermatien for the "Dine 'Or Dine-Net?" game has been campiled fram the fallewing seurces:

-Fragments 'Of Time - Field Museum 'Of Natural Histery, The Chicage Science Explarers Program, Chicage, lIIinais -Enchanted Learning - Website ~I_"';_ .... _I r-.: .... _ ... _ .... kA • .... _ •• ~ \1\1_h,.;+_


Paleo Explorers Program

Where: Time Needed:

Mosasaur Pit 30 minutes 20 students Group size:

Materials: tape measure, paper, pencil, calipers, compass, north arrow, grid, magnifiers, small rulers

Paleo Explorers Concepts: *Participants learn about the "process of paleontology" *Participants practice doing science by using small tools *Participants .study about the past to learn about the present *Participants learn to be good stewards of fossils that can tell us about creatures that lived before

Station Concepts: *Students use small tools to observe and measure fossils that they fmd *Students use prior lmowledge to infer information about adaptations

Begin: At the signs near the 301 Congress Pit on the "Process of Paleontology"

What is the name of the science that is concerned with the study of fossils? Paleontology-this is based on the study of plant and animal fossils

What is a paleontologist? A scientist who studies fossils

U What is a fossil? The remains or evidence of ancient life.

Why would scientists want to find and study fossils? Fossils tell us the history of the earth. They let us mow what happened before.

Read tbru the signs to learn about the process of paleontology from field to lab.

Mosasaur Pit

*How would you conduct a search of this pit for fossils? *Go over stewardship of fossils-no walking on fossils, once they are uncovered with the shovels, use brushes. What to do if you find fossils on your own. *Let all children dig on the Mosasaur or the Starfish slab. *If children need more jobs, these are suggestions:

Use a copy of the grid paper to sketch where the fossil is found. Use the big tape measures to find the length of the complete creature. Use calipers to measure smaller parts of the fossil. Study the diorama signs to learn more about the habitat of the creatures.

VYhat are some of the adaptations found on this creature? VYhere do you think it lived? Do you think it was a predator? Is it a dinosaur?

~eplace sand on fossils before going to next station.

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What .can we learn irom dinosaur 1racks?

1. How long is 1he dinosaur footprint? Measure the longest part, from toe to· heel in centimeters.

Footprint length:-____ cm

2. Paleontologists have figured out that dinosaurs had legs that were four times longer than their feet. How long was the dinosaur's leg? Multiply the footprint length from above by the number four (4).

Leg length ______ cm

3. We can a'lso tell how long the dinosaur was from top of head to tip of tail. Multiply the foot print length by the number fourteen (14). .

Body length:-_____ cm

4. Now measure the dinosaurs stride length. Stride length is the measurement from the heel of the rightfootprintto the heel on the next right footprint.

Stride length ______ cm

5. We can determine how fast the dinosaur was moving by knowing the leg length and stride length. Take the stride length from question 4 and find where that number would be on the bottom of the graph on the next page. Draw a straight line up until you intersect the curved line that represents the dinosaurs leg length. Now draw a straight line to the left"side of the graph to find out how many miles per hour (mph) the dinosaur was traveling. "

Dinosaur's speed ____ mph

6. Humans walk at an average speed of 4.5 mph and can sprint up to 14 mph. How does the speed of your dinosaur compare to human walking speed?

Is it slower of faster?

Do you think the dinosaur was walking or running?

Extra 7. Measure the following parts of your body.

a. Foot length (without shoes) em b. Leg length (from the floor to the top of your hip) ____ em

. c. Body length (height) cm

8.00 we have the same proportions as dinosaurs? Divide the answer to question b from above by the answer to question a. Is it close to the number four (4)? Yes/No If yes, we hctve the same proportioned legs as dinosaurs. Now divide the answer to question c by question a: Is it close to the number fourteen (14)? Yes/No:lf yes we have the same proportioned body as dinosaurs.

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Paleo Explorers Program 11-18-03

301 Congress Station:

Where: Time Needed:

301 Congress Pit 30 minutes

Materials: grid, pencils, note pads, magnifiers, measuring tape, calipers, small rulers, north arrow, compass

Program overall concepts: *Participants learn about the "process of Paleontology" *Participants practice doing science by using small tools. *Participants study about the past to learn about the present and predict what may happen in the future. *Participants learn to be good stewards of fossils that can tell us about creatures that lived before.

Concepts at 301 Congress Station: Science is made meaningful with a local story. Anyone can find a fossil.

This pit represents how fossils can be found even when scientists are not looking for them. Scientists were not looking for fossils in downtown Austin in December of 1984, in fact these fossils of some really large animals were found by consguction workers who were bulldozing a site for a 22 story building.

*How would you search an area for fossils in an organized way? *What would you do if you found a fossil while you were searching through a creekbed? *Who would you contact if you thought you had found a fossil? In Austin -Paleontqlogists at the University of Texas or the Texas Memorial Museum *If you were looking for fossils in the Austin area, what kinds of fossils would you likely find? Depends on the age of the rock 65,000,000 years ago you would find remains of marine life. 200,000-J 0,000 years ago you might find mastodons and mammoths and many other small mammals that are still alive today. 65,000,000 years ago the Austin area was under a shallow sea. Creatures that lived in the sea were not dinosaurs.

Procedure: 1. Have partiCIpants decide on an organized way to dig thru this pit and find what is buried

here. Everyone can dig the mammoth skull and tusk and do some measurements.(use calipers) Concentrate on the 2 slabs of small animal bones.

2 .. Dig and discover what fossils are in the slabs. 3. Record your findings (map and sketch) 4. Discuss what you think you have found. What inferences can you make from what you see?

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- tort-Oi6e -- eot+-uY) teAt '\ ~bb, 't - (NI)t

Materials needed: Plastic Dinos Baking Soda Vinegar Red food coloring Plastic vials

Be a Paleontologist (9/24/03)

Tool kits wlshovel, brush, goggles, tape measure, notebook, pencil, and magnifying lens. Green canvas bag with extra equipment Digital camera w/disk

The Time of Dinos (10-15 minutes) In the classroom have a variety of plastic dinos out for the children to play with as they arrive. Free play while waiting for all the guests to arrive. Gather children on the rug with their dino. Discuss anything they want to talk about:

Plant eater or meat eater? Dino or dino not? Have we ever seen a real dino? Were any of these alive in TX? What ever they want to talk about.

Lead the discussion towards the topic of "What happened to the dinosaurs?" Entertain all theories, when they get to volcanoes, ask if they would like to go make volcanoes.

One Theory of the Dinos Demise (10-15 minutes) Lead the party to the sand pit outside the Cottonwood room Get them started building their own volcanoes, then you get all the prepared volcanoes stuff off the top of the candy machine. Insert a vial of baking soda in the top of each volcanoe. Let each child pour the red vinegar (lava) into their volcanoe. (If they want to do it again, let them) Lead the discussion, after everyone is through with their volcanoe, towards "If the dinos are all gone (extinct) how do we know they were ever here?" Fossils .... would you like to go on a dig to see if we can find some fossils?"

Looking for evidence of dinosaurs. (30 minutes) Paleontologist need tools. Pass out tool bags. Walk to the pit, either across the lily pads or around the pond. Choose a pit to dig in. Use all the tools you can. Take a picture of the party either around the specimen they dug up or where the mom decides the picture should be taken. Round the children up to lead them back to the party room Remind them to wash their hand before starting to eat.

While the party guests are eating, print out the picture for the birthday child.

v Dino Detectives (3-20 minute-stations)

''Theories tt * How do we know dinos ever existed? * \Vhat can we learn from fossils? What will we never be able to know from fossils? * How do fossils fonn? What makes a fossil? eggs, bones, teeth, skin, shells, footprints * Why are all the dinosaurs gone? Are they really extinct?

~~'7 ~ ;RNITffiSCHIAN = bird-hipped herbivores

Ornithopods = Ceratopsians = bird-footed homed/beaked dinos ex: Parasaurolophus ex: Protoceratops

\;ld~ ,_ C.f'\Q~ , • and niceratops II A-~_~~CJ,: -z-~ lD~~~\J'~ ored dmos . -,11 u;WJ~ ~~ L~\ ~'~~U2) paChYCePhalosaurus~~"'tr ~ ~ ~ "

~ ctJci ~d (thi k h d" d) "'\Y./ ... ~~~ -::-l J P'T-' . ~d. - ~ - .£ - ~ e. ~~~e'~~ /"" t\~~ 'V ()~~-

lU'nV\.M ~~~ Stego~a~ry.~Q~~ ~ ~ ~~~ D ..

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S\-~*' i?~ .. ~tiiUSC~~~ea:.ainOS:~ .. ".""~ . p"P'~ ~~CARNIVORES . HERBNORES ~~-"v+-'~~ ~ Therapods = Sauropods = t--", ~ ~ ,.\ )J..~

wild-beast footed ~~ reptile-footed <?~~~ w'"t..-=> ex: Dilophosaurus .~ ~ j.JJr<.I v--4 ex: ApatosauruS . _In.v ~ ,J..t.-and Velocirapt0J.j. ~o ~ V"" lP'-~'V~~

s~ ~ a:tdT. Rex IJ./"- ~J<. 4eev:l ~~ , h _.. .---, .. ----

/q}-f ./ ~ A\cJ.ur C~~ ~~ ;;tJ-;ru~ :k>o ~o cLz-~L-~u::klEn'-: ./' '\P{,~ "Fossil Dig" &-\~--'~'/'('~

Dig forfossils in sand pit --- talk about pa1eon.:4:t=olr:::o~gt::-;:s"'s;::;-,~oA'ot;::;s~-~-r.-~--used in fossil digs, museums --- fossils found in Austin: icthyosaur and plesiosaur, cephalopods, gastropods, exogyra, .~ graphea, echinoids, mastodons, prehistoric turtles, but NO lU~t¥~ DINOSAURSI!! Why? Austin was under the ocean at the time Q

dinosaurs lived --- research still happening today --- bmy again at end for next class .

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PROGRAM DESCRIPTION: DINOSAURS

Part I Basis for program Title: Dinosaur Detectives Course Description: Search for dinosaur tracks while gathering clues

about the creatures that made them .. Dig for bones like a paleontologist and create a story about your favorite beast.

Age Level: preK- grade 2 Time: 1 hour Goal: Participants will learn about the characteristics of dinosaurs and the

uncertainty of existing theories.

Part II Instructional Plan Course Outline: Two 30 minute sessions: .

1 st: Program box---dino relics to learn physical characteristics, life strategies and defenses.

2nd: Fossil hunt---follow tracks to fossil pit and dig for fossils. (Rain plan: bubble in classroom)

Part III Resource Support Site Needs: 1 classroom and sand pit (good weath~r), 2 class looms (bad). Participant Thresholds: up to 3'0 students with 2 instructors. . 0 Transportation Needs: Outreach would require use of rain plan, also ta~es

extra time to set up. 'Resource Needs: Dino program box

Dino egg nest

. Dino d0U4h

Bones to bury and digging equip . . Laminated tracks - . Dino poster Dinosaur graph with die cut npeopleu

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Welcome to the Dino Pit!·

Here you can be a scientist and dig for Texas fossils. Fossils are the remains of plants and animals that lived a long time ago. People have found incredible fossils all across Texas. Casts of some of the best and biggest ones are buried in the pits here.

Paleontology [say "pale-ee-on-TALL-oh-gee"] is the study of ancient plants and animals. Your job as Paleontologist is to carefully uncover the fossils here. What do the fossils tell you about the animals they came from? What do they reveal about what Texas was like when they were alive?

Ready? Pick a pit and get to work!

All casts in the Dino Pit are replicas of specimens from the Texas Memorial Museum of The University of Texas Collection. They were produced by the staff of the Museum's Vertebrate Paleontology Laboratory.

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The Austin Nature and Science Center • 301 Nature Center Drive· Austin, Texas· 512-327·8180

The Dino Pit is an outdoor paleontology exhibit, built for permanent display at The Austin Nature and Science Center located in ZUker Park. The project was developed and built through a collaborative effort of The Austin Nature and Science Center, UT's Texas Memorial Museum, the Austin Community Foundation, and the architectural firm of Graeber, Simmons & Cowen, which also served as project manager. The exhibit is designed to instruct visitors about paleontology through hands-on educational experience.

Artist John Maisano was instrumental in the development and completion of the Dino Pit project, working to transform a large area at the Austin Nature and Science Center into an educational dig site for finding fossil casts. Maisano modeled the casts using many of the important and unique specimens from the collections of the Texas Memorial Museum. He created an 8' x 6' mammoth rib cage cast in bronze, for the children's entrance to the site, as well as 19 oil paintings depicting the creatures the children will find as they explore the pit.

Other features of the exhibit include dinosaur trackways, a field collection display (highlighting fossils found at the 301 Congress Avenue construction site several years ago), and an observation deck. The exhibit is incorporated into the visitor programs currently offered at the Austin Nature and Science Center including youth programs, school field trips, camps, birthday parties, adult workshops and teacher training.

"The Dino Pit will help children experience the joy of discovery," says Sarah Butler, who serves as honorary chair of the project. "It will teach respect for natural science as well as scientific principles for determining factual infonnation."

"Children get to learn about science hands on, and that is very exciting," says TMM Director, Ed Theriot. "It's wonderful to see the City of Austin and the University of Texas in partnership on this. We are particularly fortunate to have backers such as Ernest and Sarah Butler - their vision has been instrumental."

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Dino Pit Rules

1) Have Fun!

2) No metal digging tools.

3) Play nice.

4) No climbing on hillsides.

5) No digging in cliff.

6) Leave no trash behind.

7) No food in pits or around pond.

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1. I will respect both private and public property and will do no collecting on privately owned land without pennission from the owner.

2. I will remember that I am a guest at each site and will obey all regulations and policies and collect in designated areas only. I will park in designated areas only.

3. I will leave each site as I found it. Gates should be left open or closed according to how they were found. Litter and gar-bage should be removed.

U 4. I will fill all excavation holes, which may be dangerous to wildlife or livestock.

5. I will be sure that all land, property, plants and animals are left without damage to property or ecology as a result of the collecting activities.

6. I will report any significant discoveries of scientific or public interest.

7. I will follow safety guidelines, never collect near vertical walls, overhangs, edges of cliffs, unstable shelves, or any other dangerous areas. Be aware of those above and below you to avoid accidents from falling rocks.

8. I will practice conservation and take only what I can reason-ably use and will not cause damage to collecting material.

5 July 12, 2003

Theme 1

A PALEONTOLOGIST'S TOOLKIT

The techniques of science help us learn about the past.

Messages:

Know where to look.

Know where the fossil is, and what is with it.

Compare the present with the past.

It takes a team.

Anyone can find a fossil.

Theme 2

CLUES FROM THE PAST

Fossils reveal the secrets of life on Earth.

Messages:

Rebuilding the Tree of Life

Solving a mystery of sudden death

Ruling the sky

Surviving extinction

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Know where to look.

Sailbacked Vertebrate

(Edaphosaurus pogonias)

If you wanted to find a fossil, where would you start? To find fossils, Paleontologists need to lmow about geology (the study of rocks).

To find fossils from a certain time, they look for rocks that formed during that period. This sailbacked animal, for example, was found in rocks called the "redbeds" of Baylor County. Scientists mow that the redbeds formed 200 million years ago. The age of the rocks gives scientists clues about the age of the animal.

Researchers also look for rocks from the type of environment where fossil animals might have lived. Long ago, what are now the redbeds were fonned by a river delta lush with plant life. The delta attracted many kinds of animals, including the Sailback. Silt from the river quickly buried dead animals. This helped fossils to form.

This Sailback is a distant relative of living mammals. It has crossbars on its fin that make it look bumpy. Scientists still don't lmow what the crossbars and the fin did. Some think the fin controlled body temperature. Others believe it helped the animals tell each other apart or attracted mates.

Questions like these are common in science. Maybe one day you can answer them.

H. J. Sawin and E. Jones found this fossil in 1944.

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Know where the fossil is, and what is with it.

Giant Sauropod Dinosaur

(Alamosaurus sanjuan ens is )

By studying the place this skeleton was found, and the things that lay near it, we can figure out what this animal probably ate and how it lived.

Scientists found these sauropod fossils in Big Bend National Park, Texas. The fossils lay in a rock layer called the "Javelina Formation." This rock layer reveals that 65 to 70 million years ago the Big Bend area had a warm climate. Streams and flood plains crisscrossed the land.

Sometimes Paleontologists fmd an object with a skeleton that tells a lot about an animal. Scientist found polished stones inside the ribcages of sauropods like the one here. The stones probably helped the dinosaur grind up tough plant fibers that it ate.

The shapes of the bones reveal clues to a dinosaur's family tree. Texas alamosaurs, for example, descended from South American sauropods.

Sauropods were the largest land animals that ever lived. The biggest ones may have weighed around 50 tons. This is about 10 times more than African Elephants, the largest land animals alive today.

Dr. Wann Langston, Jr. and a crew from the Vertebrate Paleontology Laboratory of the Texas Memorial Museum found these bones in 1971 and 1973.

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A·PALEONTOLOGIST'S TOOLKIT


Compare the present with the past.

Onion Creek Mosasaur

(Mosasaurus maximus)

Scientists can learn about an extinct animal by comparing it with living ones.

For example, living meat-eating animals have long, pointed teeth. Mosasaurs have long, pointed teeth too, which means that they ate meat.

A modem snake's jaws are loosely hinged together. So were the mosasaur's jaws. Like a snake, a mosasaur could probably swallow animals larger than its own head!

Some mosasaur bones are similar to the shoulder and pelvis bones of living whales. These bones are loosely connected to the skeleton, and could not support an animal on land. Like whales, mosasaurs breathed air but they stayed in the water.

Mosasaurs were not dinosaurs, but giant marine reptiles. They lived during the Late Cretaceous period, about 65 to 95 million years ago. During that time, a shallow sea covered most of central North America. Mosasaurs' closest living relatives are lizards such as the Komodo Dragon and Gila Monster.

This fossil is special because at 30 feet long it is one of the largest mosasaur skeletons ever found. It is also one of the most complete.

Two UT geology students, W. Clyde Ikins and John Peter Smith, found The Onion Creek Mosasaur in 1935 in a creek bed near south Austin.

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It takes a team.

Zilker Park Turtle

(Osteopygus)

Getting a fossil from the ground to the lab takes teamwork. Many people cooperated to prepare this fossil for all to see. This turtle fossil was found right here in Zilker Park, at the Austin Area Garden Center.

Who helped?

• The visitors who found the fossils and reported them to scientists

• Scientists at the Texas Memorial Museum who studied the site

• The City of Austin, that granted a digging permit

• A large crew of volunteers who cleared and excavated the dig site

• Researchers who found bone sticking out of a newly cleared ledge

• The UT Vertebrate Paleontology Laboratory staff who collected, prepared, and preserve the fossils for study

• The scientists from other museums who visit Texas to study this fossil.

This turtle lived in the shallow seas that once covered this area. It was about 5 feet long and weighed several hundred pounds.

This fossil is unusual because it was found in the same layer of rock with dinosaur tracks. Scientists are not sure how the turtle ended up here. A hungry dinosaur might have killed and brought the turtle to the site. Perhaps the turtle traveled here on his own and the dinosaur attacked it. Maybe the dead turtle simply washed into the burial site.

Dr. Mike and Karen Duffin found the fossils in 1992.

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Anyone can find a fossil.

Shoal Creek Plesiosaur

[PLEE-see-o-SA WR]

(Polyptychodon)

Anyone can find a fossil if they pay attention and mow what to look for.

Dr. Bob McDonald is an Austin dentist and amateur paleontologist. He found this fossil while walking along Shoal Creek in Austin, looking for shark's teeth fossils. A recent heavy rain had exposed the bones of a flipper in the creek bed.

He took the loose pieces to the Vertebrate Paleontology Laboratory at the Texas Memorial Museum. The City of Austin granted a permit and digging began.

Dr. McDonald found this plesiosaur because he mew what fossil bone looks like. He had seen fossils on display at the Texas Memorial Museum and had been interested in fossils all his life. Fossil bone in this area has a distinctive look to it. When it is wet, it is a different color from surrounding rock.

This plesiosaur lived about 80 to 90 million years ago. It swam in a coastal waterway with shallow lagoons at the edge of the sea. Its bones were crushed during burial and are crumbly, so they were left as they were found. This is why you can only see the upper surfaces of the skeleton.

Dr. Bob McDonald, amateur paleontologist, found this fossil in 1990.

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CLUES FROM THE PAST


Rebuilding the Tree of Life

Early four-footed animal

(Seymouria baylorensis)

This early four-footed animal is an important fossil because it may help link together two branches of the tree of life. It is probably related to the ancestors of both modem mammals and living reptiles. Scientists do not lmow as much as they would like about the family tree of land animals, so they are very interested in this fossil.

This small animal lived about 280 million years ago near rivers that once crossed parts of north Texas. With short legs and a thick body, it was not very fast or agile. To move around, it may have swung its backbone from side to side, using its legs as props against the ground. It was probably cold-blooded and had a small brain. Judging by its teeth, it may have eaten both plants and animals. Scientists think it ate mainly insects, small animals and dead animals (carrion).

Paleontologists found this fossil near the north Texas town of Seymour. This is how the animal got its scientific name.

Paleontologists from the u.S. National Museum of Natural History found this fossil in 1917.

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u CLUES FROM THE PAST


Solving a mystery of sudden death

Starfish

(Crateraster mccarteri)

What happened here? The starfish fossils in this rock tell a story of disaster that happened millions of years ago.

Here, whole starfish are preserved in chalk. Fossils like these are very rare because U starfish are fragile. They tend to fall apart or get eaten when they die. For a starfish to

be preserve~ whole, it must be buried quickly. Yet chalk forms very slowly by the gradual buildup of calcium-containing ooze on the ocean floor.

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A powerful event must have disrupted the ocean floor. A great flood or, less likely, an earthquake might have quickly buried the living starfish. Geologists often use detective work like this to figure out the history of the Earth.

This is a small true starfish, with 5 legs. But nature sometimes produces 4-legged varieties. Can you spot the 4-legged starfish in this slab?

The fossil world owes this rare find to a rainstorm. One day in 1928, two UT Geology graduate students, W. B. McCarter and M. B. Arick, were searching for fossils. They found a large boulder in Bouldin Creek in South Austin. The fossils in this boulder are invisible when dry, but the rain revealed them.

M. B. Arick and W. B. McCarter found this fossil in 1928.

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CLUES FROM THE PAST


Ruling the sky

Giant Pterosaur [TERR-ah-SAWR]

(Quetzalcoatlus northrop i)

Birds haven't always ruled the sky. The giant pterosaur, a huge winged reptile, was the largest flying creature ever. Its wings spanned 40 feet. This is as wide as some jet fighters.

Imagine this predator and scavenger as it soared over the shores of ancient oceans. Today, those shores are the desert lands of far west Texas. This section of wing was found in Big Bend National Park, in Brewster County.

Though huge, the pterosaur was as light as a kite because of its hollow, thin bones. Fossils like these are rare because the weight of the overlying sediments usually crushes them.

These flying reptiles are only "cousins" to the dinosaurs. The pterosaurs are also separate from the other flying animals, birds and bats.

Douglas A. Lawson, a University of Texas geology student, found this fossil in 1971.

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CLUES FROM THE PAST


Surviving extinction

Early Primate

(Rooneyia viejaensis)

[RU-nee-yuh]

This early primate is a is a member of the same branch of the tree of life that contains humans. It dates back about 35 million years. Think of a lemur, and you will have a good idea of what this small mammal probably looked like.

It is an important fossil for two reasons. First, people have only found a few fossil primates of this age anywhere in the world. Second, it is incredibly well preserved. This fossil even shows the size and shape of the animal's brain.

Fossils show us that early primates came from some true survivors. Scientists still don't lmow the exact reason the dinosaurs died out. They do mow, however, that small mammals sUrvived the impact of a giant asteroid and volcanic ash that blocked the SUD. Small mammals adapted to these environmental changes very quickly. Some of them were the ancestors of early primates like Rooneyia.

Dr. John A. Wilson discovered Rooneyia viejaensis. He is the founder of the Vertebrate Paleontology Laboratory of the Texas Memorial Museum. Dr. Wilson has spent more than 60 years looking for fossils all across Texas. Although Rooneyia is a tiny fossil, it was the find of a lifetime for Dr. Wilson.

Dr. lohnA. Wilson found this fossil in {DATE??} July 1, 1963

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Pit 1 - Pertnian Terrestrial Fossils -280 MYA '"

Seymouria baylorensis Early Land-dwelling Anitllal

TMM43291-1 Clear Fork Formation, Permian Baylor County, Texas

Seymouria was a small animal that lived roughly 280 million years ago in Texas and adjacent regions. It was a land-dwelling animal that lived in what were then arid regions of north Texas. It is an important fossil for paleontologists because it is probably a close relative of both the lineage that include today's mammals and the lineage that includes living reptiles. This early, distant part of the family tree of land animals is not well understood, so Seymouria has received a lot of attention by scientists who are trying to reconstruct the tree of life.

With short limbs and a thick body, Seymouria was not very agile or very fast. To move around on land, it probably relied on undulating its backbone from side to side, using its limbs as props against the ground . .It was probably cold-blooded and had a rather small brain. Judging from its teeth, it may have had a varied diet, subsisting primarily off of ~sects, small vertebrates, and carrion.

The specimen buried in the Dino Pit was collected in 1917 from near the famous Craddock Bone Bed by-paleontologists from the US National Museum of Natural History, a part of the Smithsonian Institution. The original specimen (USNM 9140) has been periodically placed on display in Washington DC.

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Pit 1 - Pertnian Terrestrial Fossils -280 MYA

Edaphosaurus pogonias Distant Relative of Living Mammal:

Incomplete vertebral column TMM40005-1 Arroyo Formation, Pennian Baylor County, Texas

Edaphosaurus is a distant extinct relative of living mammals. Like Seymouria, another Pennian fossil that can be found in the Dino Pit, it dates back roughly 280 million years. Edaphosaurus belongs to the great lineage known as Synapsida, which includes all living species of mammals and their extinct relatives.

Like its more famous relative Dimetrodon, Edaphosaurus had a fin that was supported by bones of the vertebral column. Edaphosaurus differs from Dimetrodon in having cross-bars on the spines that supported its fin. The function of the fin has always perplexed scientists. Some have argued that it was for thermoregulation and that the great surface area provided by the fin was used to more rapidly warm the animal to the level where it could be active. Others have argued that the fin was analogous to antlers and horns in some modem mammals, and that it was used in species recognition and courtship. Both explanations may be correct.

The redbeds of Baylor County and surrounding counties are the richest in the world for fossils of early Pennian age. These rocks hold a unique record of early synapsid history and have been visited by paleontologists from all over the world. Edaphosaurus is among the rarest synapsids, and most of the specimens that have been discovered consist of little more than fragments of its skeleton. Based on its teeth, it is commonly thought that Edaphosaurus was herbivorous, but we know little of its habits.

The Edaphosaurus specimen buried in the Dino Pit was cast from an original collected in 1944 by H. J. Sawin and E. Jones. The only part of the specimen that was preserved is a part of the backbone that includes some of the spines that supported the fin, but it is one of the most complete examples of Edaphosaurus on record.

17 July 12, 2003

Pit 2 - Cretaceous Marine Fossils -85 to 70 MYA ("")

Mosasaurus nlaximus The Onion Creek Mosasaur

TMM 313-1 Navarro Group, Cretaceous Travis County, Texas

Mosasaurus maximus was a giant extinct marine reptile. It lived in shallow seas that covered much of Texas about 70 million years ago, during the Cretaceous Period. It is a member of the mosasaur lineage, which included many other species and achieved a worldwide distribution before becoming extinct about 65 million years ago. Their fossilized bones are fairly common across the state, and they are especially abundant in central Texas. But skeletons as complete as this one are very rare. Some mosasaur species were small (under 6 feet long) but others evolved to huge size. This specimen is one of the larger mosasaurs, being nearly 30 feet long. Its head alone is nearly 5 feet long and its open jaws had a gape of3 feet.

Mosasaurs lived only during the Mesozoic and are sometimes confused with dinosaurs. But lizards, snakes, and mosasaurs form their own distinctive branch of the reptilian family tree, and they are only distantly related to dinosaurs. Today the closest living relatives of the extinct mosasaurs are the members of a lizard lineage that includes the Komodo dragon and the Gila monster.

Mosasaurs were marine animals that spent virtually their entire lives in the oceans and seaways of the Cretaceous world. They may have come out onto land to lay eggs, like modem sea turtles, although some paleontologists suspect that they gave birth in the water to live young. For reasons that are not fully understood, the ancestors of the mosasaur lineage left the dry land and adapted to life in the seas.

Mosasaurs quickly evolved to tremendous size in the environment of the Cretaceous seas. With long snake-like tails and paddles for limbs, they were probably excellent swimmers, and they reached all of the oceans and seas of the Cretaceous world. Their large pointed teeth leave little doubt that they were predatory, hunting other marine animals. Several known specimens preserve possible stomach contents, which indicate that mosasaurs ate other vertebrates (sharks, bony fish, turtles, other marine reptiles, etc.). The shells of extinct mollusks known as ammonites have also been found with holes some interpreted as bite marks made by mosasaurs.

The specimen buried at the Dino Pit was cast from a beautiful skeleton found in 1935 in Travis County, along the banks of Onion Creek. W. Clyde !kins and J obn Peter Smith, geology students at The University of Texas at Austin, discovered the skeleton. They alerted paleontologists at the Texas Memorial Museum, who excavated the skeleton. It was first put on public display at the Texas Centennial in 1936. The reconstructed skeleton is currently on display at the TMM.

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Pit 2 - Cretaceous Marine Fossils -85 to 70 MYA

Crateraster mccarteri Starfish

TMM BEG 34041 Late Cretaceous (about 85 million years ago) Travis County, Texas

These starfish were found in large block of "float" in Bouldin Creek, here in Travis County. This is one of two pieces that were cut out of the 1200-pound slab. The statfish were first exhibited in 1936, and they have been gems of the Texas Memorial Museum's collections ever since.

These particular specimens are embedded in a type of rock mown as limestone, the "Austin chalk". This layer of rock was formed from the settling of fine layers of sediment onto the sea floor during the late Cretaceous, about 85 million years ago.

Starfish (also know as Sea stars) are invertebrates that can be found in oceans allover the world. They live in a wide range of marine environments, from rocky shores to kelp beds, tidal pools to depths of more than 9000 meters. They vary greatly in size and shape. Their size can range from that of a penny (1 centimeter) to as big as a bathtub (1 meter). In fact, there are about 1800 different species of starfish alive today, and hundreds more are known from the fossil record.

The body form of a starfish is stellate (star-shaped) with central disc and typically five radiating, symmetrical, arms (rays). The dimension is measured for the center of the central disc to the tip of one of the rays. Did you know that, occasionally, a "five-rayed" starfish is born with only four rays? Variation like this occurs in all natural populations. However, it's very rare that enough individuals are preserved together for us to see this variation in fossils. Can you find the four-rayed specimen on this slab? At the other end of the spectrum there is a modem species of starfish that has 50 rays. And just to add more confusion, starfish can regenerate severed rays, or intentionally remove rays.

The robust starfish have retained much of their detailed structure on this slab but have lost all their vibrant color. Modem starfish pigments include yellow, red, purple, orange, brown, gray, and blue. Original color is only very rarely preserved in the fossil record.

Modem starfish have diverse eating habits, some are carnivorous eating sponges, corals or shellfish, others are scavengers anq some are cannibals. Others are deposit feeders extracting their food from the mud, or suspension feeders sifting food from the water column.

19 July 12, 2003

Pit 2 - Cretaceous Marine Fossils -85 to 70 MYA n

Osteopygis Sp. The ZUker Park Turtle

Incomplete carapace and plastron TMM43190-1 Edwards Formation (limestones), Cretaceous Travis County, Texas

Turtles are an ancient lineage of reptiles that arose long before the dinosaurs appeared and they have survived until the present day. Most turtles live on land or in freshwater streams and lakes, but some have become adapted to life in the oceans. Osteopygis is one such marine species. It lived in the shallow seas that covered much of Texas during the Cretaceous, living together with animals like Mosasaurus and plesiosaurs like Polyptychodon. Osteopygis may have grown to about 5 feet in length, but it was by no means the largest of the Cretaceous turtles. There were others that reached more tJian twice the size ofOsteopygis, and skeletons of these giants have also been found in Texas.

The specimen that is buried at the Dino Pit was discovered by a hiker in Zilker Park. The specimen was collected by paleontologists from the Vertebrate Paleontology Laboratory of the Texas Memorial Museum. Much of the bottom half of the shell (plastron) and a few pieces of the shell's upper half ( carapace) were preserved in this specimen. It is unusual because it was found on the same layer of rock that preserved several nearby dinosaur tracks. If the entire shell and skeleton had been found, it would have represented a large animal, weighing several hundred pounds. Like other marine turtles, it probably ate fish, squid, and other marine animals.

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Pit 3 - Cretaceous Marine Fossils -85 to 70 MYA

Polyptychodon Sp. The Shoal Creek Plesiosaur

TMM42644-2 Eagle Ford Group, Cretaceous Travis County, Texas

Polyptychodon is a member of the plesiosaur family, which constituted a group of reptiles that were adapted to life in the shallow seaways that covered much of Texas 90 million years ago. The plesiosaurs form their own distinctive branch of the reptile family tree. Although commonly mistaken for dinosaurs, the plesiosaurs are only distant relatives. They were also very different from the mosasaurs, which formed another lineage of giant aquatic reptiles. The plesiosaurs became extinct near the end of the Cretaceous time period.

The anns and legs of plesiosaurs were modified into flippers that they used to 'fly' through the water, much like modern sea turtles do. Some plesiosaurs had long necks and small heads, while others had short necks and very large heads, and many grew to gigantic size. They had long, shmp teeth characteristic of animals that catch and eat fish. Together with the mosasaurs, they were among the dominant predators of the Mesozoic oceans. Although they were reptiles, they probably spent nearly all of their lives in the water, occasionally coming onto land to lay their eggs.

Dr. J. R. (Bob) McDonald, an Austin dentist who was looking for shark teeth along Shoal Creek, discovered the specimen buried in the Dino Pit. He reported the find to paleontologists at the Vertebrate Paleontology Laboratory, who collected it and put it on display in the Texas Memorial Museum in the early 1990's.

21 July 12,2003

Pit 3 - Cretaceous Marine Fossils -85 to 70 MYA n

Stantonoceras solisense Ammonite

TMMUT53002 Late Cretaceous (about 85 million years ago) Williamson County, Texas

Olohn A. MaiSlllno

This ammonite was found by Mr. Bill Jolley in Williamson County, Texas. It was generously donated for research because it is a better example of the species than the actual ''type'' specimen. A type specimen is the unique, official reference specimen for a species or genus.

Ammonites are invertebrates that can no longer be found in oceans today, they are extinct. They looked very similar to the living (extant), chambered, Nautilus, but are more closely related to squid. They lived on continental shelves and deep ocean environments and were prolific until the end of the n Cretaceous. At that point they became extinct. Nautilus survived the stress that led to the extinction of the ammonites. Why did they survive? We really are not sure; some people have suggested subtle differences in lifestyles or hatchery location of their larvae. po

Coiling styles of ammonites varied, this example is coiled in one plane others coil in two planes. This specimen is quite tightly coiled others are loosely coiled. In some each new coil covers the previous one so that you can only see the last whorl, called involute coiling and this ammonite is of that involute coiling style.

Within the coil is a series of chambers, the animal actually lived in the very last, the outermost, chamber. The chamber walls (septa) were connected with a tube (siphuncle) that allowed the animal to regulate its buoyancy by controlling gases in each chamber. A little bit like regulating a hot air balloon, except in the case of the ammonite control is within a water column and not the atmosphere.

These chambers have been very useful to paleontologists because the way the chamber wall attaches (sutures) to the outer shell has changed in complexity over time. This suture pattern is often preserved in the ammonite fossil. Paleontologists can identify particular species with the help of these suture patterns. The patterns evolve quite rapidly and become a proxy for time. Certain patterns evolved after others and that allows us to place the species in order, to date them relative to each other.

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Pit 4 - Cretaceous Terrestrial Fossils - 65 MYA

AlamosaurllS sanjuanensis Giant Sauropod Dinosaur

Humerus TMM 41398-2 FemurTMM 41541-1 Javelina Formation, Cretaceous Big Bend National Park Brewster County, Texas

Alamosaurus was named for Alamo Creek, San Juan Basin, New Mexico, where the first specimen was discovered. Alamosaurus roamed over much of southwestern North America during the latest part of the Cretaceous. It became extinct at the very end of the Mesozoic Era, during the mass extinction episode that wiped out many other species at the same time. Alamosaurus was one of the very last of the nonavian dinosaurs in Texas.

Alamosaurus was a member of the sauropod dinosaur lineage. The sauropods were not only the largest dinosaurs but also the largest land animals ever to evolve. Only some of today's baleen whales are larger. The largest sauropods may have weighed around 50 tons. This is about 10 times more than African elephants, who are the largest land-living animals alive today.

The earliest members of the lineage were small and walked on their hind legs, leaving their hands free for other purposes. But during the course of the Mesozoic, the sauropods evolved to giant size, and had to drop to all fours in order to support their gigantic weight. At the same time, they evolved almost unbelievably long necks but retained relatively small heads. Of all the dinosaurs, they had the smallest brains compared to their body size.

Alamosaurus and the other huge sauropods were herbivores. They had small blunt teeth, which they used for cropping and stripping vegetation. The discovery of polished stones inside the ribcage in several skeletons suggests that they had a large muscular gizzard containing stones to mechanically break down fibrous plants. The stones accomplished the grinding of food instead of the teeth!

The two huge bones of Alamosaurus buried in the Dino Pit were cast from specimens collected from Big Bend National Park in 1971 and 1973 by Dr. Wann Langston, Jr. and a crew from the Vertebrate Paleontology Laboratory of the Texas Memorial Museum. One bone is the humerus (upper ann bone), which 1ies between the shoulder and elbow joints. The other is the femur (thigh bone), which extends from the hip to the knee j oint. These two

. bones came from different individuals of about the same. size.

23 July 12, 2003

Pit 4 - Cretaceous Terrestrial Fossils - 65 MYA n

Quetzalcoatlus If,orthropi The Texas Pterosaur

Wing bones (humerus, radius, ulna, carpals, metacarpals,] TMM414S0-3 Javelina Fonnation, Cretaceous Big Bend National Park Brewster County, Texas

Quetzalcoatlus is the largest flying creature ever to evolve. Its wingspan was somewhere around 40 feet, which is as wide as some small jet fighters. But it was light as a kite, with hollow bones that were almost paper-thin. Quetzalcoatlus is a member of the extinct pterosaur lineage. Pterosaurs (pronounced tair-o-saurs) lived during most of the Mesozoic Era and diversified into a tremendous array of different forms. Often mistakenly called "flying dinosaurs", the pterosaurs are not members of the dinosaur lineage. Instead they are a side branch from the main stem leading towards the dino-saurian family tree and are only "cousins" to the dinosaurs. n Quetzalcoatlus and most other pterosaurs were probably predators and scavengers. Several pterosaur specimens contain the skeletons of fish in their bellies, and most of these were found in marine rocks. But many other pterosaurs, including Quetzalcoatlus, were discovered in rocks formed by lakes and streams, which indicates that they flew over dry land and probably hunted terrestrial (land-living) animals as well.

The wings of pterosaurs were different from the wings in modem birds and bats. In birds, the feathers of the wing are supported by the first three fingers of the hand (the thumb, index, and middle fingers). In bats, the thumb is free and a wing membrane of skin is webbed between the remaining fingers and along the body to the legs. But in pterosaurs, the wing was made from a skin membrane that was supported by one very long finger, probably the one corresponding to our "ring-finger". Astonishingly, flight evolved independently in pterosaurs, birds, and bats.

Quetzalcoatlus was the largest and also one of the last of the pterosaurs. It soared over Texas right up until the end of the Cretaceous Period, looking down on dinosaurs like Alamosaurus and Tyrannosaurus. It was wiped out in the great extinction event that marked the end of the Mesozoic Era.

The specimen buried in the Dino Pit was cast from a specimen discovered in Big Bend National Park by a graduate student named Douglas Lawson, who was working on his masters degree in the Department of Geological Sciences at The University of Texas at Austin, under the direction of Dr. Wann Langston, Jr.

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Pit 4 - Cretaceous Terrestrial Fossils - 65 MYA

Tyrannosallrus rex Giant Theropod Dinosaur

TMM 41436-1 Upper jaw and teeth Javelina Formation, Cretaceous Big Bend National Park Brewster County, Texas

TYrannosaurus was one of the largest of the giant predatory dinosaurs, although a few newly discovered species may have been a bit larger. Tyrannosaurus and its carnivorous relatives are members of the theropod branch of the dinosaur family tree. Their large, curved, serrated teeth are built like steak knives and are designed for tearing flesh. There is no doubt Tyrannosaurus ate meat, but there is still some debate over whether it was a predator, a scavenger, or both. Like all predatory dinosaurs, TYrannosaurus walked only on its hindlimbs. Its forelimbs were unusually tiny and their function has always been a mystery.

Tyrannosaurus was one of the last non-avian dinosaurs in Texas, and lived in the same environment as Alamosaurus and Quetzalcoatlus. Like these creatures, TYrannosaurus went extinct at the very end of the Cretaceous (65 million years ago) in the great extinction event that killed off many other species. The closest living relatives of Tyrannosaurus are modem birds.

Tyrannosaurus roamed across western North America, but only a few rare bits and pieces of its skeleton have been found in Texas. The partial upper jaw buried in the Dino Pit is just a small piece of the skeleton, but it is nevertheless one of the most complete pieces of a TYrannosaurus ever found in Texas. It was discovered in Big Bend National Park in 1970 and excavated by paleontologists at the Vertebrate Paleontology Laboratory of The Texas Memorial Museum.

25 July 12, 2003

Pit 5 - EarlyTertiaryFossil- 35 MYA

Roolleyia viejaensis Early Primate

Skull TMM40688-7 Vieja Fonnation, Oligocene Presidio County, Texas

Rooneyia viejaensis is an omomyid, a member of a prosimian primate lineage that dates back approximately 55 million years. Like other early primates, Rooneyia was small. It was about the size of the modem tarsier, which inhabits the forests of Indonesia and the southern Philippines; and the galago, which inhabits the forests of Africa. Only a single specimen of Rooneyia has been discovered, and only the skull was preserved. Without the rest of the skeleton, it is difficult to be certain how it made its living, but like most other small primates it was probably arboreal, spending its life in the trees.

Primates are very rare in the fossil record. The tiny specimen that is buried at the Dino Pit is 35 million years old and among the most complete and best preserved primate skulls ever discovered in North America. Based on the size of its orbits (eye-sockets), Rooneyia was probably active during the daylight hours. Rooneyia has broad, flattened cusps on its teeth, which may indicate a diet that was rich in fruit. One of the unique features of this specimen is that some of the bones surrounding the brain had weathered away to reveal what is referred to as a natural "endocast". An endocast is a replica of the brain that it is fonned by sediments that fill the space that was occupied by the brain in the living animal. In animals with large brains, the skull records much of the detail of the brain's surface, much like the shell of a walnut or a pecan nut. The infilling of sediment, now turned to rock, takes on the shape of the brain.

Dr. John A. Wilson, who is the founder of the Vertebrate Paleontology Laboratory of the Texas Memorial Museum, discovered this specimen in 1964. ·Dr. Wilson has now spent more than 60 years looking for fossils all across Texas. Although Rooneyia is a tiny fossil, it was the fmd of a lifetime for Dr. Wilson.

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u 'Pit 5 - Late Pleistocene Fossils - 500 to 10 TYA

Mammut americanum A111eri.can Mastodon

Incomplete skull TMM 1858-1 Pleistocene river terrace sand and gravels Live Oak County, Texas

The American mastodon has an interesting name. The name Mammut might suggest that it is a mammoth, but it is not. Instead it is a member of the mastodon lineage, which is related to but different from the elephant lineage, which includes the mammoths. The scientific name Mammut means "earth burrower". This name traces back to the Middle Ages when European fanners found the gigantic bones of mastodons in their fields and mistakenly believed that they belonged to some kind of gigantic burrowing animals. The common name "mastodon" comes from "mastodont", which means ''breast-toothed''. This term. refers to the cone-like cusps on the cheek teeth.

Mastodons are members of the group of mammals called proboscideans, which was once much more diverse and widespread. Only two species survive today, the African and Asian elephants, both threatened with extinction. Mammut americanum roamed widely over North America for roughly 3.5 million years before it finally became extinct, between about 9,000 and 12,000 years ago. Both climatic change and human hunting have been implicated in its extinction.

The Mammut specimen buried in the Dino Pit was one of the last of its kind in Texas. Declining popUlations of Mammut were concentrated in two major areas. These were the Great Lakes and the Atlantic and Gulf Coastal Plains. In Texas they probably occupied lowland valleys and swampy areas. Stomach contents have been recovered from a few specimens and these indicate that they ate the twigs and cones of conifers, leaves, mosses, grasses, and aquatic plants. Mammut probably used its tusks to strip branches from trees upon which it fed.

The specimen buried at the Dino Pit exhibits the process of tooth replacement common to mastodons, mammoths and elephants. Over its lifetime, a proboscidean uses six sets of grinding teeth in each side of both the upper and lower jaws. As the initial set is worn, it is pushed forward by the eruption of the next larger, unworn tooth.

The original specimen was excavated by paleontologists from the Bureau of Economic Geology at The University of Texas at Austin in 1939, working with support from the Works Progress Administration. Its age is estimated between 10,000 and 200,000 years

U old. It was long displayed at the Texas Memorial Museum and is now at the Vertebrate Paleontology Laboratory.

27 July 12, 2003

Pit 5 - Late Pleistocene Fossils - 500 to 10 TYA n

Geocl,elone sp. Gian t Tortoise

Shell and partial skeleton TIvIM 30967-2155 Freshwater pond deposit, Pleistocene San Patricio County, Texas

Giant land tortoises like this specimen of Geochelone roamed the coastal plain of Texas during the Pleistocene. Although this particular North American species is now extinct, having died out by about 10,000 years ago; it has living relatives on several islands of the world and on the mainland of Africa and South America. Probably the most famous members of the tortoise family are the giant tortoises of the Galapagos Islands, which were studied by Charles Darwin as he developed his theory of evolution. More distant and much smaller relatives of the giant tortoises still live North America, in the southwestern deserts, parts of Florida, and northern Mexico.

Tortoises are part ofa larger group of animals, the Testudines (turtles). Most turtles are adapted for life in wetter environments like rivers, ponds, and the oceans of the world. But tortoises are adapted to arid environments. They are almost exclusively vegetarians, and they get all the moisture they need from the plants they eat. They rarely if ever drink water. In some settings they hibernate during the winters, while in other settings they are active most of the year. In contrast to tortoises, most other turtles are carnivorous, eating fish, insects, grubs, wonns, and carrion. All tortoise species are threatened or endangered in the wild today.

We are not sure what led to the extinction of giant tortoises in North America. The change in climate at the end of the Pleistocene has been suggested, but human activity has also been implicated. In more recent years, many of the island popUlations of giant tortoises have been extirpated by human overkill, mostly by sailors who collected the tortoises for food. The introduction of rats, pigs, and dogs by humans to these islands has also had tragic effects on the slow growing turtles. Adults are generally safe, but the eggs and young are easy prey to the faster, smarter mammals.

A. H. Witte collected the specimen buried at the Dino Pit. Witte supervised the excavation, which was funded by the Works Progress Administration from 1939 to 1940. The original specimen was long displayed at the Texas Memorial Museum and is now at the Vertebrate Paleontology Laboratory.

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Pit 5 - Late Pleistocene Fossils - 500 to 10 TVA

Homotllerium serum Scimitar-toothed Cat

Skull TMM 933-3582 Friesenhahn Cave, Pleistocene Bexar County, Texas

Homotherium serum, the scimitar-toothed cat, ranged throughout Texas during the Pleistocene. Homotherium was a member of the felid lineage, which includes all extant and extinct cats (everything from lions to housecats) as well as the extinct saber-toothed cats. Homotherium was about the size of a modem lion, but it had a lighter build with long forelimbs and relatively shorter hindlimbs. These proportions indicate that Homotherium was capable of running after prey as well as leaping upon them.

The skull of Homotherium is characterized by its flattened and serrated upper canines and wide nasal opening. The wide nasal opening has been compared to that of a cheetah, and is thought to have allowed for maximum air intake, which is important for running after prey. The canines of Homotherium are not as elongate as those of the saber-toothed cat Smilodon, but were nevertheless effective weapons for killing prey.

The prey of choice were juvenile mammoths, as evidenced by more than 300 mammoth deciduous ("milk") teeth found in Friesenhahn Cave. There is no doubt that the juvenile mammoths were killed and dragged into the cave by Homotherium, for in addition to the skull cast for the Dino Pit, skeletal remains representing 19 adult and 13 juvenile Homotherium have been collected from Friesenhahn Cave, indicating that the cave was used as a den.

A field crew, including Glen L. Evans and Grayson E. Meade, from the Texas Memorial Museum found the original specimen during excavation of Friesenhahn Cave in the summer of 1949. Its age is estimated to be about 20,000 years old. This skull is at the Vertebrate Paleontology Laboratory while complete Homotherium skeletons (an adult and two kittens) are on display at the Texas Memorial Museum.

29 July 12, 2003

Pit 6 - Late Pleistocene Fossils -15 to 10 TYA n 301 Cotngress Ave.

Mamlnuthus sp. (301 Congress Mammoth)

Partial skeleton TMM 43067-37 Pleistocene river silts and clay Travis County, Texas

Mammoths are members of the group Proboscidea, so named for the elongate muscular proboscis or "trunk" which is a unique tactile (touch) and sense organ. Like other members of this group, Mammuthus exhibits skeletal modifications for bearing great weight, including column-like limbs. Mammuthus is more closely related to the extant elephants of Asia and Africa than it is to the extinct mastodons like Mammut. Evidence for this includes features of the cheek teeth, which are specialized for grinding.- The cheek teeth consist of transverse loops or plates of enamel that provide a washboard-like surface for chewing grasses. The tusks of Mammuthus are often long and curved and are found only in the upper jaw.

Mammuthus species that roamed Texas in the Pleistocene included the Columbian and Jefferson's mammoths, but not the woolly mammoth. There is some controversy as to whether the Columbian and Jefferson's mammoths are distinct species or just different populations exhibiting geographical variation. Mammoth remains have been found at several Paleo-Indian kill sites in North America. These include localities in Texas such as Lubbock Lake (Lubbock County), and the Miami Site (Roberts County). Climatic change and human hunting have been implicated in the extinction of the mammoth 11,000 years ago.

Dr. Ernest L. Lundelius, Jr. of the Vertebrate Paleontology Laboratory excavated the original specimen in 1985, with assistance from the Trammell Crow Company and Lone Star Archaeological Services. Its age is estimated to be about 15,000 years before present, based on radiocarbon dates obtained from organics in the clay immediately surrounding the bones. The skeleton is currently housed at the Vertebrate Paleontology Laboratory.

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Pit 6 - Late Pleistocene Fossils -15 to 10 TYA 301 Comgress Ave.

Amazing Fossil Discovery in Downtown Austin

On December 30, 1984, while excavating for the foundation of a new 22 - story office building at 301 Congress Ave., workers uncovered what appeared to be the remains of at least three prehistoric mastodons.

A railway station once occupied this site in the late 19th century, so archeologists working for the Trammel Crow development company where on-site to recover and document artifacts from Austin's human history. The fossil remains where found below the level of human occupation. Once it was detennined that the find was animal in nature and predated human activity paleontologists from the University of Texas were brought in to help coordinate the removal of specimens.

This discovery intrigued the popUlation of Austin. The construction company arraigned to open the site on January 19 to the public. Over 4,000 visitors were escorted down into_ the pit and allowed to witness the specimens for themselves.

On Jan 20, 1985, a mammoth skull and tusk were uncovered in a different part of the site but in the same greenish grey clay deposits that had contained the original mastodon find. By February 8, 1985 the specimens had been removed from the site along with 20 tons of dirt and clay. Over the next years, this matrix was carefully sifted uncovering even more evidence of the biological community that had called this area of Texas home.

The fossil remains combined with microscopic study of the sediments in which they were found help researchers develop a model on what this area of Central Texas was like 15,000 years ago. From the evidence, researchers conclude that this site was a marsh area along what is now the Colorado River. It probably served as a watering hole. The climate was probably cooler and more humid then the present and seasonal changes would have been milder.

A partial list of the animals found at 301 Congress Ave.:

American mastodon, mammoth, prehistoric horses, giant ground sloth, moles, short tailed shrew, meadow vole, bog lemming, muskrat, pine or prairie vole, gopher, gar, bullfrog, salamanders similar to tiger salamanders, land tortoises, various snakes including ones similar to modem day vipers, wild turkey, coyote, skunk, cottontail rabbit, deer, spiders, ants, bees.

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Introduction to the Vertebrate Fossils in the Dino Pit

. Prepared by Tim Rowe Vertebrate Paleontology Laboratory

Texas Memorial Museum March 20, 2001

I. Texas Ice Age Fossils (between 10,000 and 200,000 years old) • Mammut americanum - the American mastodon • Geochelone sp. - a giant tortoise

II. Early Tertiary Fossils (35 million years old) • Rooneyia viejaensis - a tiny primate

III. Cretaceous Terrestrial Fossils (65 million years old) • Alamosaurus sanjuan ens is - giant sauropod dinosaur • Quetzalcoatlus northropi - the giant pterosaur of Big Bend • Tyrannosaurus rex - a rare Texas specimen

IV. Cretaceous Marine Fossils (70 to 75 million years old) • Mosasaurus maximus - the Onion Creek Mosasaur • Polyptychodon sp. - the Shoal Creek Plesiosaur • Osteopygis sp. - the Zilker Park Turtle

V. Permian Terrestrial Fossils (280 million years old) • Seymouria baylorensis - an early tetrapod • Edaphosaurus pogonias one of the most distant relatives of mammals

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Ie Texas Ice Age Fossils (between 10,000 and 200,000 years old)

American mastodon partial skull

TMM 1858-1 Pleistocene river terrace sand and gravels

Live Oak County, Texas

The American mastodon has an interesting name. The name Mammut might

suggest that it is a mammoth, but it is not. Instead it is a member of the mastodont

family, which is related to but different from the elephant family, which includes the

mammoths. The scientific name Mammut means "earth burrower". This name traces

back to the Middle Ages when European fanners found the gigantic bones of mastodonts

in their fields and mistakenly believed that they belonged to some kind of gigantic

burrowing animals. "'Mastodont" means 'breast-tooth", which refers to the cone-like

cusps on the grinding teeth.

Mastodonts are members of the Proboscidean lineage, which today includes only

the African and Asian elephants. Proboscideans were once much more diverse, for only

two species survive today, both threatened with extinction. Mammut americanum

roamed widely over North America for roughly 3 million years, before it finally became

extinct, between about 9,000 and 12,000 years ago. Both climatic change and human

hunting have been implicated in its extinction.

The Mammut specimen buried here in the Dino Pit was one of the last of its kind in

Texas. Declining populations of Mammut were concentrated in two major areas. These

were the Great Lakes and the Atlantic and Gulf Coastal Plains. In Texas they probably

occupied lowland valleys and swampy areas. Stomach contents have been recovered

from a few specimens and these indicate that they ate the twigs and cones of conifers,

leaves, coarse grasses, swamp plants, and mosses. In several cases long reddish hair has

been found with some of the youngest specimens.

The specimen buried here at the Dino Pit exhibits the process of tooth replacement

common to mastodonts, mammoths and elephants. Over their lifetime, a proboscidean

uses six sets of grinding teeth in each side of both the upper and lower jaws. As the

initial set is worn, it is pushed forward by the eruption of the next larger, unworn tooth.

2

u The original specimen was excavated by DT Bureau of Economic Geology

paleontologists in 1939, working with support from the Works Progress Administration.

Its age is estimated between 10,000 and 200,000 years old. It was long displayed at the

Texas Memorial Museum and is now at the Vertebrate Paleontology Laboratory.

Giant Tortoise Geochelolle sp.

shell and partial skeleton TMM 30967-2155

Freshwater pond deposit, Pleistocene San Patricio County, Texas

Giant land tortoises like this specimen of Geochelone roamed the coastal plain of

Texas during the Ice Ages. Although this particular North American species is now

extinct, having died out by about 10,000 years ago, it has living relatives on several

islands of the world, and on the mainland of Africa and South America. Probably the

most famous members of the tortoise family are the giant tortoises of the Galapagos

Islands, which were studied by Charles Darwin as he developed his theory of evolution.

U More distant and much smaller relatives of the giant tortoises still live North America, in

the southwestern deserts, in parts of Florida, and there is a smaIl population in northern

Mexico.

Tortoises are members of the turtle family. Most other turtles are adapted to

wetter environments like rivers, ponds, and the oceans of the world. But tortoises are

adapted to arid environments. They are almost exclusively vegetarians, and they get all

the moisture they need from the plants that they eat. They rarely if ever drink water. In

some settings they hibernate during the winters, while in other settings they are active

most of the year. In contrast to tortoises, most other turtles are carnivorous, eating fish,

insects, grubs, wonns, and carrion. All tortoise species are threatened or endangered in

the wild today.

Weare not sure what led to the extinction of giant tortoises in North America.

The change in climate at the end of the Ice Ages has been suggested, but human activity

has also been implicated. In more recent years, many of the island populations of giant

tortoises have been extirpated by human overkill, mostly by sailors who collected the

3

tortoises for food. The introduction to these islands by humans of rats, pigs, and dogs has

also had tragic effects on the slow growing turtles. Adults are safe, but the eggs and

young are easy prey to the faster, smarter mammals.

A. H. Witte collected the specimen buried here at the Dino Pit. Witte supervised

the excavation, which was funded by the Works Progress Administration from 1939 to

1940. The original specimen was long displayed at the Texas Memorial Museum and is

now at the Vertebrate Paleontology Laboratory.

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II. Earlv Tertiarv Fossils (35 million years old)

Early Primate Rooneyia viejaensis

skull TMM40688-7

Vieja Formation, Oligocene Presidio County

Rooneyia viejaensis is an early member of our own primate lineage that dates

back approximately 35 million years. Like other early primates, Rooneyia was small. It

was about the size of the modern tarsier, which inhabits the forests of Indonesia and the

southern Philippines; and the galago, which inhabits the forests of Africa. Only a single

specimen of Rooneyia has been discovered, and only the skull was preserved. Without

the rest of the skeleton, it is difficult to be certain how it made its living, but like most

other small primates it was probably arboreal, spending its life in the trees.

Primates are very rare in the fossil record. The tiny specimen that is buried here

at the Dino Pit is among the most complete and best preserved primate skull ever

discovered in North America. It is probably one of the most valuable fossils in the world.

Based on the size of its orbits (eye-sockets), Rooneyia was probably active during

the daylight hours. Rooneyia has broad, flattened cusps on its teeth, which may indicate a

diet that was rich in fruit. One of the unique features of this specimen is that some of the

bones surrounding the brain had weathered away to reveal what is referred to as a natural

"endocast". An endocast is a replica of the brain that it is formed by sediments that fill

the space that was occupied by the brain in the living animal. In animals with large

brains, the skull records much of the detail of the brain's surface, much like the shell ofa

walnut or a pecan nut. The infilling of sediment, now turned to rock, takes on the shape

of the brain ..

Dr. John A. Wilson, who is the founder of the Vertebrate Paleontology

Laboratory of the Texas Memorial Museum, discovered this specimen. Dr. Wilson has

now spent more than 60 years looking for fossils all across Texas. Although Rooneyia is

a tiny fossil, it was the find of a lifetime for Dr. Wilson.

5

III. Cretaceous Terrestrial Fossils (65 million years old)

Giant Sauropod Dinosaur Alamosaurus sanjuanensis Humerus - TMM 41398-2

Femur- TMM 41541-1 Big Bend National Park

Javelina Formation, Cretaceous Brewster County, Texas

Alamosaurus was named for Alamo Creek, San Juan Basin, New Mexico, where

the first specimen was discovered. Alamosaurus roamed over much of west em North

America during the latest part of the Cretaceous. It became extinct at the very end of the

Mesozoic, during the mass extinction episode that wiped out many other species at the

same time. Alamosaurus was one of the very last of the dinosaurs in Texas.

Alamosaurus was a member of the sauropod dinosaur lineage. The sauropods

were not only the largest dinosaurs but also the largest land animals ever to evolve. Only

some oftoday's baleen whales are larger. The largest sauropods may have weighed

around 50 tons. This is about 10 times more than African elephants, who are the largest

land-living animals alive today.

The earliest members of the lineage were small and walked on their hind legs,

leaving their hands free for other purposes. But during the course of the Mesozoic, the

sauropods evolved to giant size, in part by returning to all fours in order to support their

gigantic weight. At the same time, they evolved almost unbelievably long necks, and

ridiculously small heads. Of all the dinosaurs, they had the smallest brains compared to

their body size.

Alamosaurus and the other huge sauropods were herbivores. They had small

blunt teeth, which they used for cropping and stripping vegetation. The discovery of

po Ii shed stones insi de the ribcage in several skeletons suggests that they had a large

muscular gizzard containing stones to mechanically break down the fibrous plants. The

stones accomplish the grinding instead of the teeth!

The two huge bones of Alamosaurus buried here at the Dino Pit were cast from

specimens collected from Big Bend National Park in 1971 and 1973 by Dr. Wann

Langston, Jr. and a crew from the Vertebrate Paleontology Laboratory of the Texas

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u Memorial Museum. One bone is the humerus (upper ann bone), which lies between the

shoulder and elbow joints. The other is the femur (thigh bone), which extends from the

hip to the knee joint. The"two bones came from different individuals of the same size .

. The Giant Pterosaur of Big Bend Quetzalcoatlus northrop;

wing bones (humerus, radius, ulna, carpals, metacarpals, phalanges)

TMM 41450-3 Big Bend National Park


Quetzalcoatlus is the largest flying creature ever to evolve. Its wingspan was

somewhere around 40 feet, which is as wide as some of the smaller jet fighters. But it

was light as a kite, with hollow bones that were almost paper-thin. Quetzalcoatlus is a

member of the extinct pterosaur family. These flying creatures lived during most of the

Mesozoic and diversified into a tremendous array of different fonus. Often mistakenly

called "flying dinosaurs", the pterosaurs are not members of the dinosaur family. Instead

U they are a side branch from the main stem of the dinosaurian family tree and are only

"cousins~' to the dinosaurs.

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Quetzalcoatlus and most other pterosaurs were probably predators and scavengers.

Several pterosaur specimens contain the skeletons of fish in their bellies, and most of

these were found in marine rocks. But many other pterosaurs, including Quetzalcoatlus,

were discovered in rocks formed by lakes and streams, which indicates that they flew

over dry land and probably hunted terrestrial (land-living) animals as well.

The wings of pterosaurs were different from the wings in modem birds and bats. In

birds, the feathers of the wing are supported by the first three fingers of the hand (the

thumb, index, and middle fingers). In bats, the thumb is free and a wing membrane of

skin is webbed between all the fingers, and along the body to the legs. But in pterosaurs,

the wing was made from a skin membrane that was supported by one long finger,

probably the one corresponding to our "ring-finger". Astonishingly, flight evolved

independently in each of these lineages.

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Quetzalcoatlus was the largest and also the last of the pterosaurs. It soared over

Texas right up until the end of the Cretaceous, looking down on dinosaurs like

Alamosaurus and Tyrannosaurus. It was wiped out in the great extinction event that "

marked the end of the Mesozoic and its bones were buried in the same beds as

Alamosaurus and Tyrannosaurus.

The specimen buried here at the Dino Pit was cast from a specimen discovered in

Big Bend National Park by a graduate student named Douglas Lawson, who was working

on his nlasters degree in the Department of Geological Sciences at The University of

Texas at Austin, under the direction of Dr. Wann Langston, Jr.

TyrannosaunLS rex TMM41436-1

upper jaw and teeth Big Bend National Park


Tyrannosaurus was one of the greatest of the giant predatory dinosaurs. Although

several new discoveries may be a bit larger, Tyrannosaurus remains one of the two or

three largest ever. Tyrannosaurus and its carnivorous relatives are members of the

theropod branch of the dinosaur family tree. Their large, curved, serrated teeth are built

like steak knives and are designed for tearing flesh. They leave little doubt that these

huge dinosaurs ate meat, but there is still a debate over whether they were predators or

simply scavengers.

Tyrannosaurus was one of the last of the dinosaurs, living in the same community

with Alamosaurus and Quetzalcoatlus. Like these creatures, Tyrannosaurus became

extinct at the very end of the Cretaceous, in the great extinction event that killed off many

other species. The closest living relatives of Tyrannosaurus are modem birds.

Tyrannosaunls roamed across western North America and a few rare bits and

pieces of its skeleton have been found in Texas. It walked on its hindlimbs, and had tiny

forelimbs whose function has always been a mystery. They had larger brains than other

contemporary dinosaurs, with a good sense of vision and smell.

The partial upper jaw buried in the Dino Pit is just a small piece of a complete

skeleton, but it is nevertheless one of the most complete pieces of a Tyrannosaurus ever

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found in Texas. It was discovered in Big Bend National Park in 1970 and excavated by

paleontologists at the Vertebrate Paleontology Laboratory of The Texas Memorial

Museunl.

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IV. Cretaceous Marine Fossils (70 to 75 million years old)

The Onion Creek MQsasaur Mosasaurus maximus

TMM 313-1 Navarro Fonnation, Cretaceous

Travis County, Texas

Mosasaurus maximus was a giant extinct marine reptile. It lived in shallow seas

that covered much of Texas about 75 million years ago, during the Cretaceous time

period. It is a member of the mosasaur lineage, which included many other marine

reptiles that achieved a worldwide distribution before becoming extinct about 70 million

years ago. Their fossilized bones are fairly common across the state, and they are

especially abundant in central Texas. But skeletons as complete as this one are very rare.

Some mosasaur species were small (under 6 feet long) but others evolved to huge size.

This specimen is one of the larger know mosasaurs, being nearly 30 feet long. Its head

alone is nearly 5 feet long and with its jaws open it had a gape of 3 feet.

Mosasaurs lived during the Mesozoic and are sometimes confused with dinosaurs.

But the lizards, snakes, and mosasaurs fonn their own distinctive branch of the reptilian

family tree, and they are only distantly related to dinosaurs. Today the closest living

relatives of the extinct mosasaurs are the members of a lizard lineage that includes the

Komodo Dragon and the Gila Monster.

Mosasaurs were marine animals that spent virtually their entire lives in the oceans

and seaways of the Cretaceous world. They may have come out onto land to lay eggs,

like modem sea turtles, although some paleontologists suspect that they gave birth in the

water to live young. Their immediate ancestors were terrestrial reptiles. For reasons that

are not fully.understood, the ancestors of the mosasaur lineage left the dry land and

adapted to life in the seas.

Mosasaurs quickly evolved to tremendous size in the environment of the

Cretaceous seas. With long snake-like tails and paddles for limbs, they were probably

excellent swimmers, and they reached all of the oceans and seas of the Cretaceous world.

Their long, pointed teeth leave little doubt that they were predatory and that they were

hunting other marine animals. Several known specimens preserve possible stomach

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u contents, which indicate that mosasaurs ate other vertebrates (sharks, bony fish, turtles,

other marine reptiles, etc.). The shells of extinct mollusks known as ammonites have also

been found with bite marks that were probably made by mosasaurs . . ' The specimen buried here at the Dino Pit was cast from a beautiful skeleton found

in 1935 in Travis County, along the banks of Onion Creek. It was discovered by W.

Clyde Ikins and John Peter Smith, who were UT geology students at the time. They

alerted paleontologists at the Texas Memorial Museum, who excavated the skeleton. It

was first put on public display at the Texas Centennial in 1936. The complete skeleton is

currently mounted and on display at the TMM.

The Shoal Creek Plesiosaur Polyptychodon sp.

TMM42644-2 Eagle Ford Fonnation, Cretaceous

Travis County, Texas

Polyptychodon is a member of the plesiosaur family, which constituted another

group of reptiles that were adapted to life in the shallow seaways that covered much of

U Texas about 75 million years ago. The plesiosaurs form their own distinctive branch of

the reptile family tree. Although commonly mistaken for dinosaurs, the plesiosaurs are

only distant relatives. They were also distinct from the mosasaurs, which fonned another

lineage of giant aquatic reptiles. The plesiosaurs became extinct near the end of the

Cretaceous time period.

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The arms and legs of plesiosaurs were modified into flippers that they used to

'fly' through the water~ much like modem sea turtles do. Some plesiosaurs had long

necks and small heads, while others had short necks and very large heads, and many grew

to gigantic size. They had long, sharp teeth as are characteristic of animals that catch and

eat fish. Together with the mosasaurs, they were among the dominant predators of the

Mesozoic oceans. Although they were reptiles, they probably spent nearly all of their

lives in the water, at most coming onto land to lay their eggs.

Dr. Bob McDonald, an Austin dentist who was looking for shark teeth along

Shoal Creek, discovered the specimen buried here in the Dino Pit. He reported the fmd to

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paleontologists at the Vertebrate Paleontology Laboratory, who collected it and put it on

display in the Texas Memorial Museum in the early 1990's.

The Zilker Park Turtle Osteopygis sp. TMM 43190-1

Edwards Group (limestones), Cretaceous Travis County, Texas

Turtles are an ancient lineage of reptiles that arose long before the dinosaurs

appeared and they have survived until the present day. Most turtles live on land or in

freshwater streams and lakes, but some have become adapted to life in the oceans.

Osteopygis is one such marine species. It lived in the shallow seas that covered much of

Texas during the Cretaceous, living together with animals like Mosasaurus and

Polyptychodon. OSleopygis may have grown to about 5 feet in length, but it was by no

means the largest of the Cretaceous turtles. There were others that reached more than

twice the size of Osteopygis, and skeletons of these giants have also been found in Texas.

The specimen that is buried here at the Dino Pit was discovered by a hiker in

Zilker Park. The specimen was collected by paleontologists from the Vertebrate

Paleontology Laboratory of the Texas Memorial Museum. Only part of the bottom half

of the shell was preserved in this specimen. It is unusual because it was found on the

same layer of rock that preserved several nearby dinosaur tracks. If the entire shell and

skeleton had been found, it would have represented a large animal, weighing several

hundred pounds. Like other marine turtles, it probably ate fish, squid, and other marine

animals.

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u v. Permian Terrestrial Fossils (280 million years old)

Se.l·mouria baylorensis TMM 43291-1

Clear Fork Formation, Pennian Baylor County, Texas

Seymouria was a small animal that lived roughly 280 million years ago in Texas

and adjacent regions. It was a land-d\velling animal that lived in what were then arid

regions of north Texas. It is an important fossil for paleontologists because it is probably

a close relative of both the lineage that include today's mammals and the lineage that

includes living reptiles. This early, distant part of the family tree of land animals is not

well understood, so Seymouria has received a lot of attention by scientists who are trying

to reconstruct the tree of life.

With short limbs and a thick body, Seymouria was not very agile or very fast. To

move around on land, it probably relied on undulating its backbone from side to side,

using the limbs as props against the ground. It was probably cold-blooded and had a

rather small brain. Judging from its teeth, it may have been an omnivore, subsisting

U primarily off of insects, small vertebrates, and carrion.

The specimen buried here in the Dino Pit was collected in 1917 from near the

famous Craddock Bone Bed by paleontologists from the US National Museum of Natural

History, a part of the Smithsonian Institution. The original specimen (USNM 9140) has

been periodically placed on display in Washington DC.

Edaphosaurus pogonias 40005-1

Arroyo Formation, Permian Baylor County, Texas

Edaphosaunls is a distant extinct relative of living mammals. Like Seymouria,

another Pennian fossil that can be found in the Dino Pit, it dates back roughly 280

million years. Edaphosaurus belongs to the great lineage known as Synapsida, which

includes all living species of mammals and their extinct relatives. Also included among

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these early synapsids is the more famous fin-back Dimetrodon and many other fonns that ~

are best know from the redrock country of Texas.

Like its more famous relative Dimetrodon, Edaphosaurus had a fin that was "

supported by bones of the vertebral column. Edaphosaurus differs from Dimetrodon in

having cross-bars on the spines that supported its fin. The function of the fin has always

perplexed scientists. Some have argued that it was for thermoregulation and that the

great surface area provided by the fin was used to more rapidly wann the animals to the

level where they could be active. Others have argued that the fin was analogous to

antlers and horns in some modem nlammals, and that it was used in species recognition

and courtship. Both explanations may be correct.

The redbeds of Baylor County and surrounding counties are the richest in the

world for fossils of early Pennian age. These rocks hold a unique record of early

synapsid history and have been visited by paleontologists from all over the world.

Edaphosaurus is among the rarest synapsids, and most of the specimens that have been

discovered consist of little more than fragments of its skeleton. Based on its teeth, it is

commonly thought that Edaphosaurlls was herbivorous, but we know little of its habits.

The EdaphosClurus specimen buried here in the Dino Pit was cast from an original

collected in 1944, by H. J. Sawin and E. Jones. The only part of the specimen that was

preserved is a part of the backbone that includes some of the spines that supported the fin,

but it is one of the most complete examples of Edaphosaurus on record.

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DINOSAURS AND DINOSAUR NATIONAL MONUMENT: A RESOURCE PACKET FOR TEACHERS AND STUDENTS

Dryo-saurus= ________________ _ (Its teeth were shaped somewhat like oak leaves)

Stego-saurus= ________________ _ (Its back was "roofed" with a double row of bony plates)

The dinosaurs are classified into several groups which have also been named in this same way. Some dinosaurs, for example, had hip bones shaped 'like those of lizards, while other dinosaurs had bird-like hips. These groups, then, are called the Saurlschlans (lizard-hips) and the Ornithischians (bird-hips). The chart below shows how the Quarry's dinosaurs are classified. Can you translate the group names too?

-.. ~- ···~:~:~-~:.::--~~~·<:-~~~.~:~;c~~~.-:~,~~~~:-~~-- ~-.,- . - -"':'"'; "SAURISCHIANS

Saur~pods ~ ,':. : .. . Thero-pods = ' ..

" . , .

(they had feet . (their feet had like lizards)?,,:· ',".

,,,~ ~ "beastly" claws)

'" • - .- ;~ ~ ... -, •• '!'., ..

Apatosaurus .~ ,: ~ Allosaurus Barosauruf1 Ceratosaurus Camarasaurus Diplodocus

Combining words . Pronunciation aile? AL-oh apater ah-PAT-ah baro- BARE-ah bronter BRON-tah camara- KAM-ah-rah campter KAMP-toe cerater sair-AT-oh -demus DEE-mus dine? DIE-nuh diple? DIP-Iuh -docus DOE-kuss dryer DRY-uh -ischian ISS-kee-an omitho ORE-nith-oh -pod pod -saur, -saurus sawr, SAWR-us steger STEH-gah thero- THAIR-oh

ORNITHISCHIANS

Ornitho-pods =

(they had feet like birds)

Camptosaurus Dryosaurus' >'. ,,"

From Greek word alios apate baros bronte kamara kamptos keratos demas deinos diploos dokos dryos ischion ornithos pod sauros stege thero

Stego-saurs =

(they had' plated backs)

Stegosaurus

Meaning other deceptive

.. heavy thunder chamber bent homed body terrible double beam oak hip joint bird foot lizard, reptile roofed, plated beast

NATIONAL PARK SERVICE \f' DINOSAUR NATIONAL MONUMENT

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Preface: Dinosaurs and Arcbeology

Paleontologists and archeologists solve puzzles based on clues found in

the Earth. Conclusions drawn by-both groups of scientists can never be proven,

and are open for debate and future discovery. For example, despite all of the

dinosaur literature and movies we have been exposed to, no one can be sure of

what dinosaurs exactly looked like because there were no humans there to see

them!

Diflosaurs are of great interest'to children today, perhaps because they

were a group' of animals that became extinct-a potential all modem children are

aware of living in the shadow of "the bomb." Perhaps the interest is based on the

resemblance of dinosaurs to popular images of monsters, or perhaps it stems

from the fact that dinosaurs were obviously more powerful than man is

now .. :Whatever the reason, this interest give children the incentive to explore

and enjoy the puzzle left by giant fossils. Ask your campers what makes .

dinosaurs interesting to them.

In presenting information about dinosa~s, it is important to remind .

campers that this informationJs mostly speculation and hypothesis. NO

HUMAN BEING HAS EVER SEEN A DINOSAUR! Their skin could have been

gray, or ,pink, or even yellow with purple stripes! Discussions about dinosaurs

present good opportunities" to talk about scientific hypotheses in general.

Dinosaurs wePe animals. They faced, the same needs that animals face

today-for space, food, water, and shelter. In your discussions you may want to

hypothesize on how these needs may have been for the dinosaurs. Discuss how

the scientist have made the conclusions that they have concerning what some

dinosaurs ate, whether they traveled in groups, etc.

Texas is a great place to study dinosaurs! Sixteen different' species of

dinosaurs lived in Texas~ And in Central Texas, the abundant limestone holds a

wealth of dinosaur .. tracks and fossils. Read the information from Dinosaur Days in Texas for more background information about the dinosaurs that lived here

Exploring the puzzle of the dinosaur is similar to exploring the puzzle of

pet?ple that lived on this Earth before us. In many cases the only information

that archeologists have to go on·comes from the things they left behind, buried

in the. ground. Recorded history ,gives us information concerning events that

were considered "importanf' at the time that they occurred, but ra,rely provides

~onnation about the day-ta-day experiences of people. ' Often, ,th~se details are

deduced from the artif@cts found around settlements. For information

__ ~ _____ .-.-b,;;.'~ __

..--..-------.........-~~.-£.. .. ~~.~. =-_ .... -------------

concerning prehistoric societies, or societies without a written history, artifacts

provide the only clues.

_ In .exploring archeology with the campers, try to emphasize the contrasts_

in lifestyle for present day society and societies of the past. Discuss what

archeologists 500 years from now might conclude from the artifacts of our

society. Just·as midden piles provide a wealth of information about past peoples,

our trash dumps will certainly provide similar information in the future. What

would the campers want people in the future to know about us?

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. -DINOSA.1J I~S

Dinosaurs are members of a group known as archosaurs, ('ruling reptiles'), which include the crocodiles, the,extinct pterosaurs and those well-knownarchosaur descendants, the birds, as well as other less well-known extinct creatures, such as thecodontians. The dinosaurs are distinct (rom other archosaurs-Cor one main reason which is that they were able to walk and run extremely efficiently; their legs ar.e tucked in beneath the body rather than being held out from the sides. Dinosaurs lived during t,he Mesozoic Era, Cmiddle life') which comprises the Triassic, Jurassic,and Cretaceous Periods which lasted from ,about 22S -64 million years ago. Animals that lived before or alter the Mesozoic are not dinosaurs. For example, giant woolly mammoths which lived within the last minion years or so are not dinosaurs; nor are the large sail-hacked reptiles of the Permian Period such as Dimetrodon. All Dinosaurs were land living creatures. The gigantic sea monsters

, of the Mesozoic (plesiosaurs) and the flying reptiles, (Pterosaurs) were not dinosaurs. '

Dinosaurs are divided into two dasses: Sawischia <-reptile hipped') and Omi thischia (tbird hipped') dinosaW'S. The two different hip structures are below.

~----------~,--------~~~ ~ __________ ~~~-------r~ ~----------~'--------~~~

( V DINOSAUR CLASSES The Saurlschian dinosaurs are further divided into three groups: 1) the theropods, 2) the sauropods, and 3) theprosauropods. .

. The Theropods were caqrlvores. Like birds, and humans they walked on two legs. The forelimbs of the theropods were entirely useless for locomotion. The theropods come in all sizes from Comsognathus about the size of a chicken to Dein~eirus whose hand and ann measwing 2.5 meters (about 8 feet) were discovered in the Gobi Desert. These dinosaurs first appeared in the mid-Triassic and lasted until the end of the Cretaceous. This group included Tyrannosawus rex, Allosaurus, Omi tholestes, and Struthiomimus.

. .

The Sauropods were the largest of all the dinosarus. They first appeared in the early Jurassic and persisted through the Cretaceous. Most of the sauropods were built along the same lines: large banel-shaped bodies with stout columnar legs and long necks, disproportionately small heads and very long tails. These are the dinDSaurs that most people picture living in swamps. In tad they were not confined to swamps and other aquatic environments. Sauro~s were the dominant herbivore in the Jurassic and remained as a minor element of the fauna through the Cretaceous. Examples include Apatosaurus, Diplodocus, and Brachiosaurus.

( , V The Prosauropods 'are the probable ancestors of the sauropods. Most of these dinosaurs were plant eaters. They were bi-pedal and quadripedal. The pros~uropds appeared in the-Late Triassic and disappeared-by the Jurassic. Plateosaurus 15 an example of a prosauropod.

_~I,'I "'!!E.("?""!!-etf.'r'""~~~ .-

The Omithischian Dinosaurs were the mos"t ~ommon and diverse dinosaurs. They ~'ere a major food source for the theropods. Members of the Omithischia occurred (rom the Jurassic to the Cretaceous. The Ornithischian are divided into the ornithopods, the stegosaurs, the ankylos.aurs,. and the ceraptosa~rs ..

The Ornithopods first appeared in the mid-Triassic and were the last Omithisdans to disappear. All were capable of standing erect and they could also stand and walk on (our legs. The dentition of ornithopods was somewhat varied. Varied dentition (adlitated chewing of food, something reptiles normally do not do. The orm thopods included Heterodontosaurus, Campto.saurus, Laosaurus, Hypsilophodon, and Iguanodon.

The Stegosaurs were a small group including only a few species. They existed only during the Jurassic and were probably never very abundant. The most striking features of these dinosaurs was the double row of assymebically arranged back plates. Assymetry is very unusual in a vertebrate and its possible significance will be discussed later. Examples of stegosaurs include Stegosaurus and Kentrosaurus .

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The Ankylosaurs were an abundant and diverse group during the Cretaceous. All species were encased in bony armor to varying degrees. Examples include Ankylosa urus, Palaeoscincus, Polancanthus, Syrmosaurus, and Pinacosaurus. .

The most sbiking feature of the Ceratopsians was an arrangement of horns on brow and/ or snout and bony shield"projecting from the back of the skull. -Most of the ceratopsians were seven to nine meters long and weighed three .to four tons. This group seems to have originated in Asia in the last part of the Cretaceous with . Psi ttacosa urus and Protocertaps. The first known dinosaur eggs were found in association with Protoceratops. All other ceratopsian species were found in North America where Triceratops was the most common. Tricer!tops along with Tyrannosaurus rex and the duck bill, Anatosaurus, were among the last of the dinosaurs.

" COLD BLOODED VS. WARM BLOODED There is some debate whether dinosaW'S should be grouped with th~"reptiles. Reptiles are ectothermic or "cold-blooded" which means that they rely on external stimuli to regulate body temperature. In other words a reptile uses the heat of the ~1.l:f' or wann air or ~aJm ~ock surfaces to raise its body temperature and it moves Into the shade or into a burrow to lower its body temperature. The opposite of ectothennic. animals are .. endothermic animals like mammals and birds. An endotherrilic:iv. ~arm-bl00ded" animal relies on internal metabolic processes to generate heal 'Ectotherms cannot warm themselves in freezing temperatures or cool themselves in hot temperatures except by moving toward or away from heat sour~. Endothenns can be active whenever they want without the warm-up period required by ectotherms. Endotherms also have greater endurance. Endotherms require higher energy levels to maintain body temperature and therefor must eat more than ectotherms. A bird with a high metabolism must eat constantly during the day to maintain its metabolism and thereby its body temperature. A snake with a .slow metabolism may eat once a week or even less often.

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· [I Uact] TEXAS DINOSAURS [sheetZ I[

ullName: CHINDESAURUS (CHIN-dee-SAWR-us)

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FACTS: Therapod/walked on 2 legs Meaning of name: uspirit lizard" (for place found)

Range: Texas Panhandle, Arizona Period: Upper Triassic (225-220 mya) Hips: "Iizard" (Saurischian) Length: 10 feet Weight: 200 Ibs Diet: Meat

5 feet

DESCRIPTION! INFORMATION: Chindesaurus is of great interest bacause it is the most primative dinosaur known from the Texas Docum Group which is a red rock strata made up of a series of sand, silt, and mud formations deposited by lakes and rivers in a big, low, collecting (depositional) basin that had no outlet to the sea. Only a thigh bone and part of a hip bone were found, but by comparing them with more complete fossils of Chindesaurus found in Arizona, we can say that they lived in Texas. It is very similar to the Eoraptor and Herrerasaurus from South America, which are the earliest dated theropods (meat eaters/lizard hipped) from the beginning of dinosaur history.

ChindesauTUs was small by the standards of later dinosaurs, but it was actually a large predator for early Triassic times.

Though liHle is known about its overall anatomy and life-style, we can say that it ran on its back legs, had smaller front legs, and a long tail for balance. Its teeth are clearly those of a meat-eater.

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'II [fact] TEXAS DINOSAURS [sheet1 II

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Name: COELOPHYSIS (SEEL-o-FIE-sis)

FACTS: Therapod/waIked on 2 legs Meaning of name: Mhollow-form" Range: Texas Panhandle, New Mexico Period: Late niassic (225 to 220 my a ) Hips: ulizard" (Saurischian) Length: 6-7 feet Weight: 65 lbs. Diet: Meat

, , 5 feet

DESCRIPTIONI INFORMATIONi'" ,This was a slender small theropod dinosaur that walked on its back feet, had forelimbs 1/2 the length of its hindlimbs, with curved claws on both, and had sharp, serrated bladelike teeth. Its head was small and narrow and its neck long and Us" curved. Its eyes were large and it could probably see very well. Long legs allowed for fast movement, and a long tail was used for counterbalance. The meaning of Coelophysis is ntlollow-form" which refers to its slight build.

Coelophysis probably ate whatever it could catch. Young may have eaten mostly insects. They probably lived in groups at least some of the time, but it is unknown what size groups they formed. At Ghost Ranch in New Mexico, there were large numbers which may have been brought together by drought. They appear to have been swept away by a flood and later buried. They range in size and age from young to full grown.

Only a few scattered remains such as teeth and a few bones of Coelophysis have been found in Texas. However scientists believe it, or a very close relative, lived in

;> _. Texas during Triassic times.

~'6=~~==--~~----------------------------~--~ 1 1

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[I Yaet1 TEXAS DINOSAURS [sheet] II

Name: TECHNOSAURUS ( TEK-no-SAWR-us) I

Statistics: walked on 2 legs Meaning o/name: IITechno" for Tx. Tech Un- sponsor of dig Range: Texas Panhandle Period: Late Triassic (225-220 mya) Hips: IIBird" (Ornithsichian) Length: 5 feet Weight: 60-70 Ibs Diet: plants

5 feet

OESCRIPTIONrINFORMATION: Very little evidence of plant eating dinosaurs has been found at this time in the Oocum formation from the Triassic. The paleontologist Sankar Chatterjee from Texas Tech University in Lubbock, Texas, found a group of fossils together in the same location. There were leaf-like teeth from a plant eater that Chatterjee recognized as being from an omithischian or bird hipped dinosaur. He named the new dinosaur TechnosauTUs for Texas Tech University, the institution that sponsored the dig..'}· 'J. ..: , . • . ..

However, identification of an upper jaw fragment which was found in the same site is suggested to be from a prosauropod. Thus, fossils from 2 different kinds of animals may have ended up together. It is likely that both kinds of animals lived there at the same time.

Comparison of the teeth to other dinosaurs that lived at the same time indicate that they may have been like African Triassic dinosaurs such as LesothosauTUs. The continents were joined together during the Triassic period in a single supercontinent called PANGEA and northern Africa and North American were close to each other. Therefore TechnosauTUs and Lesothosaurus may have been closely related.

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yaet] TEXAS DINOSAURS [sheetl II

Name: ACROCANTHOSAURUS (ACK-roh-KAN-tho-SAWR-us)

FACTS: Therapod/walked on 2 legs Meaning o/name: IIhigh spined lizard" Rallge: N. Cen.Texas, Oklahoma Period: Lower Cretaceous- (119-105 mya) Hips: IIlizard" (Saurischian) Length: 25- 30 feet Weight: 2 to 4 tons Diet: Meat

5 feet

DESCRIPTIONl INFORMATION: The scientific name of the Acrocanthosaurus refers to the tall spines on its vertebrae. They were covered and may have looked like a sail or a hump running along its back. The reason for the raised sail or hump is not known, but may have helped with temperature regulation.

The 113 long-toe" footprints at Glen Rose that may have been made by Acrocanthosaurus are given a separate name, "Ireneasuripus", because scientists can't be sure who made the footprints. They can tell they were made by one of the large meat eaters. The trackways from this time period also has tub sized footprints of a sauropod, probably Pleurocoelus. They are found together at the Dinosaur Valley State Park, but we don't know if they were both there at the same moment or nol

The theropod footprints here at the Bamberger Ranch are younger than those near Glen Rose and may have been made by an AcrocanthosauTUs, a descendent, or a close relative.

The serrated knife-like teeth of the Acrocanthosaurus leave no doubt of its meat diet. It probably ate whatever it could catch or scavenge, and because it was quite large it could probably take large prey.

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II Uact1 TEXAS DINOSAURS [sheet1 II

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Name: DEINONYCHUS (die-NON-i-kus) FACTS: Therapod/walked on 2 legs Meaning of name: Iiterrible claw" Range: N. Cen. Texas, Oklahoma, Montana Period: Lower Cretaceous- (119-105 mya) Hips: lllizard" (Saurischian) Length: 10-11 feet Weight: 175 Ibs. Diet: meat

5 feet

DESCRIPTION! INFORMATION: Deinonychus probably lived in Texas but the evidence is scant. They lived north of Texas and where there is evidence that they fed on Tonontosaurus. Since Tonontosaurus was abundant in Texas, it can be assumed that they traveled and lived further south in what is now Texas.

The name means Iiterrible claw" which refers to the sickle-like claw which was carried in an upright position on the hind feet of this Therapod. This claw was used to slash prey when attacking. Deinonychus had four toes on its feet. The first toe/claw bent backward and didn't touch the ground. The second was the slashing claw which could be moved separately. The third and fourth were on the ground and carried the weight of the animal. The uhands" had sharp claws also and could have been used to hold onto a prey animal while it used the slashing claws to made deep wounds.

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Deinonychus belongs to a group of dinosaurs called Dromaeosaurids or Ilrun_ ning reptile". All the members of this group were built for speed. They are believed . to have hunted in packs, and with their speed, their terrible claws, and cooperative hunting tactics, they were able to bring down large prey.

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[I yaet] TEXAS DINOSAURS [sheet11

II p.. . 'Name: rlmltlve ORNITHOPOD from Proctor Lake

FACTS: Ornithonod/walked on 2 or 4 feet Meaning of name: Il},ird foot" Range: N. Cen.Texas, Arkansas, Oklahoma Period: Early Cretaceous (Twin Mtn.) Hips: "bird" <Ornithischianl Length: up to 6 ft. Weight: up to 85 lbs Diet: Plants

__________ ~ ________ ~ ________ ~ ________________ __JJ Sfeet

DESCRIPTIONI INFORMATION: At Proctor Lake in Comanche County, Rusty Branch, a graduate student discovered many skeletons of different sizes of this small Primitipe Ornithopod (referred to as Hypsilophodont in ULone Star Dinosaurs") dinosaur in what must have been a nesting ground where the flock hung oul Their hands had five fingers, their hind legs four toes. When foraging for plants they probably moved around on 4 feet, but to move fast, they ran on 2 feel They may have bounded from plant to plant (like a kangaroo). Their high-ridged teeth could slice up vegetation. A horny beak covered the tip of the mouth.

The site where the bones are found is a quarter mile long outcrop of red sedimentary rocks, which is unusual in the Twin Mountain Formation. The strata, doHed with 60 concentrations of Primitive Ornithopod bones, tell us about the environment in which these dinosaurs lived, which was an ancient river floodplain over 50 miles from the sea shore. The climate was warm, semiarid, and there were seasons. More young animals were found than old. Bones of some of the adults are still articulated (still joined together). Most of the young animals are found as a jumble of bones from many individuals that colleded in small depressions on the old land surface. The animals of each concentration of young appear to be about the same size, but the size

U of the animals vary from one concentration to another. Few other types of dinosaur bones were found there. There was something special about this area that brought them together- perhaps it was a safe, protected nesting area.

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II ljactl TEXAS DINOSAURS [sheetl II 1

u Name: PAWPAWSAURUS (paw-paw-SAWR-us)

FACTS: Armored /walked on 4 legs Meaning of name: lizard from "Paw Paw Formation" Range: North Texas - Ft. Worth Period: Cretaceous- (97.5 to 100 mya) Hips: IIbird" (Omithischian) Length: 15 feet Weight: 1.5 tons Diet: plants

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5 feet '

DESCRIPTION! INFORMATION: There is a wonderful story about the discovery of a baby Pawpawsaurus within the city limits of Ft. Worth. A 12 year old and his father, Johnny and John Maurice, were looking for shark's teeth in the Paw Paw Formation when they discovered bones that looked like fossilized remains of a fried chicken dinner. The bones were taken to Dr. Louis Jacobs of SMU who identified the bones as being from a baby "nodosar" an armored bird hipped dinosaur. It was probably newly hatched when it fell into the water where its remains were scavenged by crabs and sharks for approximately a month before it was covered with sediment (Calculations of Ilone month" was based on the age of the oyster spat (larvae) that had attached to the cleaned bones. )

A beautiful and mostly complete skull of an adult PawpawsauTUs was found by 19 year old Cameron Campbell, who worked at the Ft. Worth Zoo. There are even bony eyelids preserved with it. The bones of both the IIscutling" and adult are on display at the Ft Worth Museum of Science and History. The armor is bony plates embedded in the skin. It has side spines but lacks the tail club seen on ankylosaur group of armored dinosaurs.

The Paw Paw Formation was deposited when the sea along the south eastern shore of the Great Western Seaway was shallow.

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II [fact] TEXAS DINOSAURS [sheet] i U Name: PLEUROCOELUS (PLOOR-o-SEEL-us)

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FACTS: ro walked on 4 legs Meaning of name: uSide-cavity" Range: N. Cen.Texas, Arkansas, Oklahoma Period: Early Cretaceous (119-105 mya)

ips: 1I1izard" (Saurischian) Length: 50 ft. Weight: 30. tons Diet: Plants

, . , .~ 5 feet

DESCRIPTIONI INFORMATION: Pleurocoelus means IIside-cavity" which refers to the cavities in the sides of the vertebrae of its long neck. It had a very long neck, walked on 4 legs, and left large footprints around central Texas. The front and back footprints are different. The front limbs left tracks that were smaller and rounder than the back ones, with a cleft at the rear. Footprints made by the back feet are longer than wide with claw marks on the front edge that can be seen on the clear ones. Classic examples can be found in the Paluxy River near Glen Rose and on the Blanco River near Blanco. Pleurocoelus appear to have traveled in herds. The name given by ICHNOLOGISTS (Scientists that study fossil footprints and trackways) to footprints most likely made by this sauropod is IIBrontopodus". Tracks of Pleurocoelus at both Glen Rose and Blanco are in the Glen Rose Formation. Skeletons have also been found in the Glen Rose area.

The teeth of Pleurocoelus are peg-like, are relatively uncomplicated and were probably used to gather plant material. Their digestion was most likely aided by IlgiZ_ zard stones" or gastroliths sometimes found in the gut regions of sauropod skeletons,

U and by micro-organisms that most likely lived in their digestive tracts.

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/ II yaet1 TEXAS DINOSAURS [sheet1 II

U Name: TENONTOSAURUS (te-NON-to-SAWR-us)

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FACTS: mi h d walked on 2 or 4 legs Meaning of name: "sinew lizard" Range: N. Cen.Texas, Arkansas, Oklahoma Period: Early Cretaceous (Twin Mtn.) Hips: ubird" (Omithischian) Length: 15-20 ft. Weight: 1 ton Diet: Plants

r,

5 feet

DESCRIPTIONl INFORMATION; Tenontosaurus which means 'ISinew lizard" was chosen because this dinosaur has bony, ossified tendons running along the vertebrae of the tail that hold it stiff. The stiff tail acted as a balance to the body, especially when it ran on 2 legs. Though it could run on its hind legs, it probably walked and browsed on all four. It has four toes on the hind foot and five on the &ont The front limbs are strong but shorter than the hind limbs. Some of the footprints at the Dinosaur Valley Park may have been made by them, but scientists are not sure.

The teeth are heavy, used for crushing and grinding tough vegetation. Tenontosaurus belongs to the group of dinosaurs known as Uhypsilophontids" which means Uhigh-ridged tooth".

Though several skeletons of Tenontosaurus have been found in Texas, one of the most noteworthy discoveries was made by a 7 year old boy, Thad Williams, and his father Ted, when they were walking along a creek and found a skull. They knew it wasn't from a modem animal and so they contacted the Fort Worth Museum of Science and History. The landowners gave permission to the museum and SMU to excavate. The complete skeleton of that Tenontosaurus is now on display at the Ft

U Worth Museum.

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II Uactl TEXAS DINOSAURS [sheet1 II

R

U Name: ALAMOSAURUS (AL-a-mo-SAWR-us)

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FACTS: ro 0 walked on 4 legs Meaning of name: named for place found in NM Range: W. Texas, New Mex., Utah, Wyoming Period: Upper Cretaceous- (73-65 mya) Hips: lllizard" (Saurischian) Length: 70 ft. Weight: 30 tons Diet: Plants

5 feet

DESCRIPTIONlINFORMATION= Alamosaurus bones were discovered near a Navajo trading post in New Mexico early in the 1900's. In Spanish Ualamo" means Ucottonwood tree" and the trading post was named IIOjo Alamo" for the spring and coHonwood tree nearby. So this dinosaur is named for the trading post and not The Alamo in San Antonio.

Alamosaurus probably looked somewhat like Pleuroceolus, in that it walked on four sturdy legs, and had a long neck. However, it was 20 feet longer and weighed less than Pleurocoelus. It may have had some armored plates in its skin.

Recently some skeletal remians of a sauropod were found in Big Bend that indicate that they got even larger than previously thought In January of 2000 there was an article in the San Antonio Express News about the Big Bend Discovery by the UT at Dallas researchers. They found vertebrae from a dinosaur which was huge, about 100 feet long. The vertebrae may be from an exceptionally large Alamosaurus, which is the last known Sauropod of the Cretaceous Period, or an entirely new species.

Alamosaurus is a member of the titanosaur family which are primarily found south of the equator. It did not arrive at Big Bend until the Javelina formation was being deposited, which was after the Aguja formation was deposited.

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! ffactJ TEXAS DINOSAURS [sheet1 II

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Name: CHASMOSAURUS (KAS-mo-SAWR-us)

FACTS: Ceratopsian I walked on 4 legs Meaning o/name: IIwide-open lizard" Range: W. Texas, Big Bend Period: Upper Cretaceous- (73-65 mya) Hips: Jlbird" (Omithischian) Length: 15 feet Weight: 2 tons Diet: plants

5 feet

DESCRIPTIONI INFORMATION: All Ceratopsids have long heads, much of which is a broad frill of bone that extends over the neck and shoulder region. It can be plain or decorated with bony projections, and if the frill is very long it may have openings in the bone. All dinosaurs in this group have a toothless beak. The jaw has chewing teeth in the back.

Chasmosaurus is the most common dinosaur in the Aguja formation, which was deposited in a time when rivers and streams built deltas through low marshy or swampy lands. Water loving plants lived there in abundance which provided food for the dinosaurs. Chasmosaurus held its head low and probably fed on low-growing vegetation. They are in the same grQup as Triceratops. Chasmosaurus has openings in the frill bones, which is what its name uwide-open" refers to. Living there at the same time were duck-billed hadrosaurs, ankylosa urs, and theropods.

At one site the remains of ten to fifteen individuals were recovered representing juveniles, subadults and adults. This site suggests that they were together as a herd and that they experienced some sort of catastrophic event, such as a flood, a drought, or a freeze. Because the land was low-lying the bodies were covered and prese~ed.

Chasmosaurus of various ages have horns of different lengths, and frills with more or less scollops and/or horns. They may have changed as the animals matured, and also they may have been different in males and females.

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II UactJ TEXAS DINOSAURS [sheet] II

U Name: EUOPLOCEPHALUS (YOO-o-plo-SEF-a-Ius)

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FACTS: Armored walked on 4 legs Meaning of name: Ilgood weapon head" Range: W. Texas, Big Bend Period: Upper Cretaceous- (73-65 mya) [Aguja) Hips: IIbird" (Omithischian) Length: 20 feet Weight: 2 tons Diet: plants

5 feet

IDESCRIPTIONI INFORMATION: The Euoplocephalus is an armored dinosaur of the ankylosaurid family that lived in the river deltas, marshes and swamps that became the Aguja formation of the Upper Cretaceous near the end of the period.

Evidence from a Cretaceous trackway of an armored dinosaur indicates that they walked with their legs under their body. Their backs were at least partly stiffened by bony tendons running down either side of the spine, and especially near the end of the tail. A tail club was formed by enlarged bones embedded in the skin that are fused to each other and to the tail vertebrae forming 2 lobes. When swung from side to side by the powerful tail muscles, the tail club was an effective weapon, and could undoubtedly have been used to break the leg of an attacking theropod.

Bony plates embedded in the skin, and even bony eyelids protected the head. Bony plates studded with spikes run down the back for the length of the body.

Euoplocephalus and other armored dinosaurs were originally imagined to be slow moving tortoise-like animals, because of their shape and weight. Scientists now think of them as more active rhinoceros-like animals, that were capable of very fast

U movement. With large therapods on the prowl they needed speed and protection!

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II Uact] TEXAS DINOSAURS [sheet111

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Name: KRITOSAURUS ( KRIT-o-SAWR-us)

Statistics: Hadrosaur /walked on 2 or 4 legs Meaning o/name: "separated lizard" Range: W. Texas, Big Bend Period: Upper Cretaceous- (73-65 mya) -Aguja Fm. Hips: Lellgth: 20-25 feet Weight: 1-2 tons Diet: plant

5 feet

DESCRIPTIONI INFORMATION:' Kritosaurus' name comes from Greek word "krino" which means Jlseparated" or "parted" which probably refers to the arrangement of the cheek bones in the skull, which were lose to allow chewing.

Kritosaurus was a medium sized crestless dinosaur in the hadrosaur family. Many other dinosaurs in this family had crests of various shapes which may have given them the ability to make trombone like sounds. Kritosaurus has a large bump on its snout in the area of the nostril opening. It also has a large duck-like beak which was used to gather plant food. The rasp-like grinding surface of the teeth combined with an up and down chewing motion crushed their food, which may have included some woody twigs along with leafy material. The Aguja environment was one with rivers running through marshes and swamps near the coast. Geological evidence indicates that all hadrosaurs in North America lived in coastal plains. The paleontological evidence shows that at least some hadrosaurs took care of their young in nesting colonies. Maybe they all did.

The anatomy of Kritosaurus indicates that it was able to stand comfortably on its hind legs. Like many other herbivorous "bird-hipped" dinosaurs, it may have grazed with its front feet on the ground.

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II ljactJ TEXAS DINOSAURS [sheet1 i

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IName: TOROSAURUS (TOR-o-SAWR-us) I FACTS: Ceratopsian/walked on 4 legs Meaning of name: Ilpierced lizard" Range: W. Texas, Montana, SD, Ulah, Wyoming Period: Upper Crelaceous-(73-65 mya) (Javelina fm.)

Hips: ubird" (Omithischian) Length: 25 feet Weight: 6-8 tons Diet: plants

, 5 feet

DESCRIPTIONI INFORMATION: Torosaurus bones were found in the Javelina formation, which was the last formation deposited during the Cretaceous period. The meaning of the name Ilpierced lizard" indicates that this Ceratopsian dinosaur had holes in its bony crest. The crest and head of Torosaurus together was the size of a small car. The edge of the crest was without horns or scallops. Three horns, two above the eyes and one above the nose adorn the face along with a beaked mouth with strong teeth for grinding course vegetation.

Like the rhinoceros or elephant today, few predators would have risked attacking such a formidable dinosaur. Weighing 8 tons and moving at a good pace on its stout legs, head armed with sharp horns with neck and upper back protected by the enormous frill this dinosaur must have held its own, even against Tyrannosaurus rex.

Like other homed dinosaurs (Ceratopsians) Torosaurus probably moved around in herds, which made them safer from predators, especially the young which could be kept in the center of the herd.

Torosaurus were among the last dinosaurs of the Cretaceous, and some of them , must have been around to wibtess whatever catastrophe ended the era of dinosaurs.

~b=~~~~~~==~~==~~~~-=~----~~~==~==~~~

23

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NAME:

DATE:

Human andHerrerasaurus Comparisons

Human Herrerasatlrus Characteristics of the Skeleton

Has reptilian skull with sharp teeth for slicing meat.

Has mammalian skull with different types of teeth for slicing and grinding different types of food.

Has vertebrae.

Has scapula (where front limbs attach to body).

Has pelvis (where rear limbs attach to body).

Has clavicle.

Body held hOrizontally over pelvis by tail.

Has ribs.

Has sternum.

Has four limbs.

Has three major leg bones (femur, tibia, fibula).

Legs held directly under body when standing or walking.

Legs sprawled out from the body like a lizard or salamander.

Walks on two legs.

Walks on four legs.

Has a patella.

Walks on toes.

79

NAME:

DATE:

Hwnan Skeleton

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14.

15.

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17.

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11.

12.

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Illustration by Carol Abraczinskas and Paul Sereno

NAME:

HerrerasaunIS Skeleton DATE:

~

C'I

B

t N

A

B

C

D

E

F

G

H

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L

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M ________________ __

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Illustration by Carol Abraczinskas and Paul Sereno

Herrerasaurus Skeleton - Answer Key

.'---'"

(I

B

--t N

('

A Skull

B Vertebrae

C Ribs

D Pelvis·

E Scapula

F Humerus

G Manus (Phalanges)

H' Metacarpals

I Radius

J Ulna

K· Femur

L Fibula

M TIbia

N Pes (Phalanges)

o Metctarsals

r-- -, I ' '.

( H1Jman Skeleton - Answer Key

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13. scapula (shoulder blade)

14. ribs

15. vertebrae

16. radius

17. c~aIs (wrist)/ metacarpals

18. phalanges (fingers)

i \ \

81

1. skull

2. clavicle (collar bone)

3. sternum (breast bone)

4. humerus

S. pelvis (bJp bones)

16. radius

8. patella (knee cap)

9. fibula

10. tibia

11. tarsals (ankle)/metatarsals

12. phalnges (toes)

Layers of Time .. -.,:~. Background Information: SCientists carefully note the layer L'IIII of earth in which fossils are found. Geologist then

~ correlate the rock strata and determine relative age of the fossil.

Problem: How do scientists determine the age of fossils?

Hypothesis: _______________________ _

Materials: Large clear plastic cups, m1xing bowl, water, 4 or 5 d~erent colors of Jello, clean plastic fossils, drawing paper, pencil,. transparency showing a rock strata with fossils.

Procedures: 1. Follow the instructions for making the Jello but reduce the water to 1/2 of that in the recipe. 2. Place a 'fossil' in bottom of the cup. 3. Carefully, Without splashing, cover the fossil With one color of Jello. 4. Refrigerate until the Jello sets up. 5. Repeat steps 1-4 with each color of Jello. 6. Complete observations.

Observations: 1. Draw and label an illustration of your rock strata model. 2. Label the oldest and youngest rock layers. 3. Draw and label an illustration of the rock strata displ,ayed on the overhead. 4. Label the oldest and youngest rock layers. 5. Compare the fossils pictured and identify characteristics to those in your model. Try and identify the actual age of one of your fossil models.

Conclusion: Refer to the problem.

Extra,: Get a spoon and eat your model! Be sure to clean the plastic fossils and return them to the teacher.

u

Very short version of Dinos8ur Clossificlttj·on REPTllES- are divided into 4 groups according to skull formation, based on openings other than the eye socket. rSid- from Gr.: opening)

t - ANAPSID

2- SVNAPSID

.~ 3- EURVAPSID

extinct: primative reptiles

/todoy- tllrtles 811d tortoises

extinct: mammal like reptiles / todoy= (rnommols)

·DIMETRODON

extinct - sea d'w'elliflCJ reptilesl today none Ichthyosaurs &. Pleios8urs ._--......1. ~

4- DIAPSIDS

~ extinct

PTEROSAURS *PTERRNODON

//odoy= snoJ.'es., /iZ6rd~ and crocodi Iss (olt?:! 5 )

~# \, ~ . DIN 05 A!!. R 5 iand llvi llQ,erect gait~lived beMen 225 and 64 million IjI"S ago , I THECOOO!'lTS . V '-....1.,., •• 01 ...... A."S""~ .

t OR" IT" I SCH I ANsl bird-hipped herbivores

*PRRASAUROlOPHUS 1'. \'t" :. -~ J.. ~T.::l-

tPacbgcc p hal esa urS] (thlCk-~)

t Cerate psi a ns ) . (hOrned/beaked)

*PROTOCERATOPS ~+ 'Ii' -! " J' .. , {) OJ.... J ... : "

.yJIICERRTOPS

'" ~,.\!1eg~~~)?/ . .. :.' .. ~ .. ;:.!~rmor-p18ted)

*STEGiSAURUS

V [AntlJlosaQ~

(SAURISCHIANS \ . reptile-hipped carnivores &. herbivores

I (.:, . L./:' . ~,.,.'" 'J p' .' , •••• -" \.

·0 I LOPHOSRURUS

GEOLOGIC TIME SCALE RA PERIOD EPOCH

QUATERNARY Recent

U I "I~~ION T[AIt. ~Ielstocene O~. ___________ ~ ________ ~ N ~-Oc Z ~ W~ U·

TERTIARY , .. "".LION '[t."S

CRETACEOUS 70 MILL!ON YURS

Pliocene

Miocent

01l90C8ne

Eocene Paleocene

CHARACTERISTIC LIFE

1 ~ #w~ W

~~~ ~.~ JURASSIC ~ tIA ~ en ~ 45 "I~LIO" TUItS ., , ~

:E. I---TR-'A-S-Sr-c--+-------. ~ , ", .:.: ~ltQ W2 ~ so MI~LION YURS - ~ T :;;.;

(.) -. Oo!

PERMIAN 55. MILLION TEARS

~ PENNSYLVANIAN ~ 30 M'LLION YEARS &&J ~

z~---------+--------~ o ~ MISSISSIPPIAN ct 5' M'LLION yiARS (.)

N.:i o c DEVONIAN W -! 5& MILLION YEARS ...JC

~~~------------.--------~ a. SILURIAN

20 M'LL,ON YEARS

ORDOVICIAN 75 MILL'ON 'fEARS

CAMBRIAN 100 M'LL.ON TEA'"

PRECAMBRIAN ERAS

PROTEROZOIC ERA

ARCHEOZOIC ERA

APPROXIMATE AGE OF THE EARTH MORE THAN 3 81LLION 300 MILLION YEARS

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-~- .. - -- --- - - -- - -. - _. --___ -.a

OINOSAUR THEROPOD SAUROPOD ORNITHO~vO STEGOSAUR CERATOPSIAN ANXYLOSAUR TYPES

"'fOAl. POSTURE 1"10&" OUaO·~'OAl. '''0 OUaOfl''',o,,, ou.o.,,'t~ O\.IoI~'fOA" OU&a.v"to","

-

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fll'M oct OC'lltte. SI'Ur 10-'14 0It'(& IICCir (\.1,;1-",&, ra~

DIE T CA.~ ..... NOItCIuI IC .... O«IUS IC~ 14(~ tC·~.

OTHER "A", ~IO WI nt fIO~WI.\. WUO( IOOY.

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• 'DUCIO '0111- IIiIO raIl. • ·aucJt-M.l.ro· ,.""" 14(AO

• roe", IUIIoD "",,·,"er REMARKS "' .... '.1"" IC&O

C'lI&fO~." "'&C..c)~." JIIIJII.~S-C 11 TIlIQ)SAUII\ISoC I"LtO'ClIIoCU'·C "'-"OUAJllU'." o-I'\.oooeus •• COlt, f'Ioo01AI.IIUt -II .-.oTc.ct II. ro, ... EXAMPLES ""'MWItO~_1I #IIO#mJ$M.IIII4- ./ "'M:I#fHHIII- , S'FH$IUIIV6." '.ICC.Art1'.- , AMlrl(J$.lUtlU$.,

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FLYING REPTILES - PTEROSAURS-GROUP AGE TEETH TAIL HEAD SIZE EXAMPLE

,,0lIl U, S.M.". .-a.~ RHAt.f'HORHYNCH

."'L 111' .. .., .... , .u~ 4..:::· ... .,. ..... run ••• DCVILO"I lI\IIDDCe ""er .......

II C" O' I 'Clf ...... ,1ICMIf

"Ia_ U.8 ...,.,., ....... III'" • .,. 111& .. ~~~ -~ "-'L fill ..... '" PTERODACTYLOIDS Me .. to ... n • .-.. ~ dI'&caIUS

roo""' .... . ,., .. \MMI .. '" ... ...., ... '"If "' ... MESOZOIC SWIMMING REPTILES

GROUP AGE DESCRIPTION SIZE HABITAT EXAMPLE ....... ~-,

'" ..... "_", .. -. u.,...,. ICHTHYOSAUR '. IC .. \.0. .. __ "' ..... . ..... ..,...... _ ........ ca·

u .. ,....~

\.I'~'''', ....... '1.6" .... '-I "De, .... · ... ...... ~ MOSASAUR CllCf&CIlWI

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I'1'UAUW

A' .. n-.. ~ ,.. ... "Gel ... .. --.&.

~~ ..... L.- u ... . .-PLESIOSAUR .. ...... .., .. ca "e ........

_fICIl ... ........ ~. ....... " .. -. .. nt .... _ n.n.a. ..... .nc .... CHELONIA .. -~--

Itn ....... .. crU.",,, ..... ., .... fUll. fI ... ,...., ~-,

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II'MIa:II ... I'Ift

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BASIC

DINOSAUR CLASSIFICATION

THEROPODS Meat-Eaters

CERATOPSIANS Horned

SAUROPODS Gigantic Plant-Eaters

ANKYLOSAURS Armored

STEGOSAURS Plated

"'S-A-U-R-IS-"C-H-I-A-N-S-~~ • ORNITHISCHIANS Lizard-Hipped-----I-------Bird-Htpped

Dinosa urs Dinosaurs THECODONTS

Common Dinosaur Ancestor

15

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DINOSAURS AND DINOSAUR NA'TlONAL MONUMENT: A RESOURCE PACKET FOR 'l'kACHERS AND STUDENTS 41

Yes, there were many kinds of prehistoric animals, and not all of them were dinosaurs, nor did they all live at the same time. This chart shows some of the better-known animals, and explains what they were and when they lived.

5 .0 fb ~c&

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The "Ice Age" did not kill the dinosaurs, because they had become extinct long before then, However, many other large animals-mostJy mammals such as these-lived at that time.

The time since the extinction of the dinosaurs is often called the "Age of Mammals." Actually the first animals to take over the land after the dinosaurs were large flight

less birds like Diatryma, but soon the mammals outgrew and outnumbered them. Eohippus and Uintatherium (named for the Uinta Mountains near Dinosaur

National Monument) were typical early Cenozoic mammals.

A wave of extinctions marked the end of the Mesozoic Era. Not only the dinosaurs but also all the pterosaurs, sea reptiles, and many invertebrate groups-perhaps half of all life on earth-died out forever at the same time.

r - - ONLYTHE ANIMALS INSIDETHIS LINE WERE DINOSAURS

I Thesewere I some of the I last dinosaurs.

I I -~-=--~~~\07 I I

Pterosaurs, the flying reptiles,

were not dinosaurs but close relatives.

Ammonoids were among the many invertebrates that died out at the end of the Mesozoic Era.

Several groups of reptiles (not closely

I These were some of I The Jurassic

I the first dinosaurs. in the Triassic Period but they remained I Archaeopteryx related to dinosaurs or

even to each other) developed streamlined bodies and paddle-like

legs, and swam the Mesozoic seas.

~~ small and insignificant until the dinosaur's may have be~n I '\ "~ long reign ended. I a bird, or a dlOo-

I I --..: I saur, or both. It

had feathers and I I a dinosaur-like L ____________________ .J skeleton.

Like the Mesozoic Era, the Paleozoic Era closed with dramatic, worldwide extinctions. Then, too, about half of all known life, including the trilobites, sea scorpions, pelycosaurs, and many other groups, perished abruptly.

Hard-shelled sea scorpions and trilobites were some of the first animals commonly preserved in rocks. Earlier soft-bodied creatures such as worms and jellyfish are known but their fossils are rare.

~ ~

Primitive fishes appeared in the middle of the era.

DINOSAUR NATIONAL MONUMENT NATIONAL PARK SERVICE

In the last third of the Paleozoic era, amphibians like Eryops established a foothold on land. Early reptiles

such as the "sail-backed" pelycosaurs (not dinosaurs) soon followed.

Therizinosaurus From Wikipedia, the free encyclopedia

Uherizinosaurus ('scythe lizard', from the Greek therizo meaning 'to reap' or 'to cut off and sauros meaning 'lizard') was a very large therizinosaur (previously known as segnosaur). It could grow up to 10-12 nleters (33-40

feet) long and reach 3-6 tons in weight[)]. TherizinosClurlis lived in the late Cretaceous Period around 70-75 million years ago. and was one of the later and largest representatives of its unique group. Its fossils were first discovered in Mongolia and when it was discovered it was originally thought to be a turtle (hence the name chelon(formis - turtle-formed) but it is now accepted as a maniraptoran theropod dinosaur.

!Contents i

i !

t

! • 1 Discovery and Species I • 2 Characteristics !

I I • 3 In popular culture I I • 4 Footnotes Ii

l • 5 References I ._ ... _ ......... _. ____________ ---...i

Discovery and Species

l jle first fossils now attributed to Therizinosaurus were discovered in the late 1940s by a joint Soviet-Mongolian fossil expedition. The expedition

unearthed several giant claws that lneasured up to a meter in length. However. it was not known \vhat creature these belonged to until the early 1950s, when further fossil expeditions unearthed 1110re bones: several n10re sets of cIa\vs and parts of a forelilllb and hinc11in1b. Sl1bs~ql1ent finds in northern China allowed paleontologists to assen1ble the general skeletal structure of the animal, which was determined to be a dinosaur and not a turtle. In 1954, the animal was named Therizinosaurlls ('scythe lizard'), referring to the enormous claws. At present, there is one accepted species -T. cheloniformis.

The recent discovery of several related dinosaurs - Alxasaurus in 1993 and

TI,erizinosalirus Fossil ran : Late Cretaceous

Kingdom: Animalia

Chordata

Sauropsida

Phylun1:

Class:

Superorder: Dinosauria

Order: SZlurischi a

Suborder: Theropoda

(unrClnked) I'v1C1nirZlptonl

Family:

Genus:

Species:

TherizinosCluridae

TherizilloslI lIrliS

T. clzelolliJorl1lis

1,erizinosaurlls clzelon'tnl"H7I'~1 Maleev 1954

Beipiaosaurus in 1996 - helped clarify the positio-; of the therizinosaurs as a whole. Various theories had been proposed to explain the ancestry of these dinosaurs, with some scientists even suggesting they were descendents of the sauropodomorphs - but these new, well-preserved fmds, giving details about the bird-like pelvis, feet and skulls, helped confirm that the therizinosaurs were all maniraptoran, theropod dinosaurs.

Characteristics

Therizinosaurus had a small head with a beaked mouth, atop a long neck. It was bipedal and had a large, heavy ~ l ? body, as evidenced by the wide pelvis, 2.5 meter (8 foot) long arms and legs that ended in four toes (three brWhich supported the animal's weight), which were tipped by short, curved claws. The Inost distinctive feature of the animal was the presence of three gigantic claws on its front limbs. Each of the three digi ts of its hand bore these claws, which reached nearly a lneter (approximately 2-3 feet) in length. The largest claw was on the

first digit[]].

The feeding habits of Therizinosaurus are still debated, but it was most probably an herbivore, using its big claws to push leaves into its mouth. Other hypotheses suggest that it was a termite eater, using its claws to openn large termite nests - but it seems highly unlikely that an anima] the size of Therizinosaurus could survive on a . diet based on insects and features of the skull (including a beaked mouth and flattened teeth) suggest a

herbivorous diet(l] . It is thought that Therizinosaurus lived a similar lifestyle to modern gorillas or prehistoric ground sloths~ using its long arms and sharp claws to grab food and foliage from trees.

There are other possible functions that could have been served by the claws of Therizinosaurus. such as defense against predators (e.g. the contelllporary Tarhosallrus) and in intraspecific fighting. such as fighting for territory or for mating. The claws may even have served all these functions.

It is highly likely that Therizinosaurus was feathered, given that its close relative BeipiaosGlIrus certainly was.

In popular culture

Therizinosaurus appeared in the BBC Walking With Dinosaurs special "Chased By Dinosaurs".

Therizinosaurus appears in the PlayStation video ganle Dino Crisis. In the game, Therizinosaurus is portrayed as an active predator rather than a herbivore.

Footnotes

1. 1\ abc Svarney, Thomas E. and Svarney~ Patricia Barnes. "The Handy Dinosaur Answer Book". 1st ed. Canton, MI: Visible Ink Press, 2003.

References

Parker~ Steve. Dinosaurus. 1 st ed. Buffalo. NY: Quintet Publishing. Ltd .. 2003.

Retrieved from ''http://en.wikipedia.org/wiki /Therizinos8urlls''

Categories: Cretaceous dinosaurs I Asian dinosaurs I Therizinosaurs

• This page was last modified 16:18,8 January 2007. • All text is available under the terms of the GNU Free Documentation

License. fSee Copyrights for details.) Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a US-registered 50 1 (c)(3) tax-deductible nonprofit charity.

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Therizinosaurus cheioniformis (Maleev in 1954)

Name Means: "Scythe Lizard" Pronounced: Ther-ih-Zin-o-Sore-us When it lived: Late Cretaceous - 77-71 MYA Where found: Mongolia, China 1948

Length: 26 feet (8 m) Weight: 1,000 pounds (450 kilos)

Therizinosaurus has been an intriguing puzzle for scientists ever since several huge claws were first discovered 1948. Although there was not enough fossil material to determine its appearance, the claws were so unique that tt had to be from a new species. Maleev named it Therizinosaurus cheloniformis in 1954.

Around ten years later another large claw was found, but this time along with other fossils, including a tooth, par the front and rear limbs and even a four-toed foot. They gave paleontologists enough material to get a fairly good . .-o!:

of the animal's body. No skull had yet been found to provide material for head reconstruction. ' .~~ A series of finds in Mongolia in the late 1980?s showed that huge arms that had been previously attributed to

Deinocheirus, actually belonged to the same group as the huge claws and strange bones attributed to Therizinosaurus. Parts of the pelvis and other bones were also found, which gave paleontologists an even better I at what was shaping up to be the strangest dinosaur ever to walk the earth.

Therizinosaurus had a small head, a long neck, short tail and a large body. It was so bulky that it could not havE been a very fast runner. Its most distinctive feature was gigantic claws on its front limbs. They were nearly three· long. The feeding habits of Therizinosaurus are still debated, but it was most probably an herbivore, using its big manual claws to push leaves into its mouth.

While the claws were very long, they were not sharply curved. In cross section, they were quite thin. Some scientists think they were used to tear open termite mounds. Therizinosaurs had a fairly long neck, small head, an teeth that could have been used to eat plants. The family previously known as segnosaurs is now named after thi~ peculiar dinosaur.

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DINOSAUR TEETH alELS alELS

.. _--------------------. - . Camarasaurus : Looking at an animal's teeth can give you a lot of

I Tooth ., &: ' h' l' d D' h 11 ~Patula-Shaped : lnlonnatlon on ow It lve. lnosaur teet can te Il_ ,I tooth : you a lot about the animal, including the type of

:~ ) i !food that it ate, how it obtained that food, and how I J}~ Root :much further digestion was required (did it chew its . ___ ~.t __ ?~c:.)!n.?:r:o.?l.;c.?,!, _~ food, crush it, or just wolf it down?).

. : :e: r·. Spinosaurus : ~ \ \. Tooth : ~? \ \. f-- Pointed : g "'.\ tooth, I ;::::- \ \ r e ... or no' : 3 \ ...... , serrations'

: Rool ~ .. \ : broken' orr \ .•. ) . 1 ~ : 2cm

U Teeth are harder than bone and therefore fossilize more readily than bones. Many fossilized dinosaur teeth have been found. Some species of dinosaurs (like Cardiodon, Deinodon, and Trachodon) are lmown only from fossilized teeth.

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The number of teeth that dinosaurs had varied widely. Some, like Gallimimus and Omithomimus, had no teeth. T. rex had 50 to 60 thick, conical teeth. The dinosaurs with the most teeth were the hadrosaurs (the duck-billed dinosaurs), which had up to 960 cheek teeth.

Dinosaurs had replaceable teeth; when a tooth was lost or broken, another one grew in to take its place.

SA URISCHIANS:

-Sauropods: ~ The plant-eating sauropods (like Apatosaurus, Brachiosaurus,

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- u - Pi~t~~~~~-~~~Diplodocus, Supersaurus, etc.) had peg-like or ~- -u ~'~ u Dipi~d~~~~": :, ~Tooth:, spoon-shaped teeth for stripping foliage but not for :, '~\ Tooth

: \ Le~-::t~ed : chewing. The tough plant material was digested in : e tooth

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' Pencil-shaped

: 5 \-.(V' : their huge guts, possibly in fermentation chambers, : ~ ~ := ~f- A®©a i and frequently with the aid of gastroliths (gizzard ~ N 1/1 ~ Rool

: ' 03>ZMmScllo)ol.o:om : stones, which were stones that the animal swallowed) : \., 'DZ,)om;;(ho;"",',

.. ------------------_ .. that helped to grind up the leaves and twigs. ' -----------------.... '

__ ~I~~~~p-~_<!~,; _ _ _ ® ELS Theropods (like T. rex, Giganotosaurus, (" ______________ _ : \" Allosaurus : Carcharodontosaurus, Allosaurus, Spinosaurus, etc.) were: Troodon 3 : I I Tooth I ' { Tooth " : I .. ,\, :meat-eaters that had sharp, pointed teeth for tearing flesh : ! I: : ~ 1,1"", ~ s~:r~d : and/or crushing bones. A recent discovery of a : 'I } '~ :

: ~ '\ tooth ~ Tyrannosaurus rex coprolite (fossilized feces) containing : \ ~ ~f.: : \ ", H-- Root, : crushed bone indicates that T. rex did indeed crush its : \ ~::e~d:

". 'T - broken off I ' ",J

:. ___ . __ . :~~7~J:~~~':~~:(~:(~(~: food with its strong teeth and powerful jaws. : __ 1 ___ ~rl! __ 1 ______ '

ORNITmSCHIANS: The herbivorous (plant-eating) Ornithischians and some pro sauropods had varied teeth, but mostly had horny beaks and many blunt, leaf-like cheek teeth for nipping and sometimes chewing tough vegetation.

-Stegosaurids: ~Stegosaurids (like Stegosaurus and Kentrosaurus) had leaf-shaped teeth.

, --------------

-Hadrosaurs (the duck-billed dinosaurs which included Maiasaura, Parasaurolophus, Edmontosaurus, Lambeosaurus, etc.) had about 960 self-sharpening cheek teeth. They had more teeth than any other dinosaurs.

-Iguanodontids: (like Iguanodon, Ouranosaurus, and Probactrosaurus) had teeth similar to those of modem-day iguanas. The rounded, notched crown of the teeth were curved.

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.Heterodontosaurus~- was a small Omithischian dinosaur that had three different U kinds of teeth (hence its name) and a beak. The sharp, cutting front, upper teeth were used

for biting against the horny beak, the cheek teeth were for grinding food, and it also had two pairs of long, canine-like teeth that fit into sockets.

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·Ceratopsians ® , like Triceratops, Styracosaurus, :g IN

Monoclonius, and others, had toothless beaks that were used to gather: their food and many flat cheek teeth which were used to chew tough, fibrous plant material.

• Most dinosaurs, like the Ankylosaurs (which included Ankylosaurus, Sauropelta, Euoplocephalus, etc.), could not chew their food and might have had large fermentation chambers in which the tough plant fibers were digested. Ankylosaurs had teeth that were shaped like a hand with the fingers together.

,l .Ornithomimids'~ (like Omithomimus, Ansermimus, Gallimimus, and

Struthiomimus) had no teeth, only beaks, with which they ate plants, insects, and small animals .

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HERDS AND PACKS OF DINOSAURS

Some dinosaur species apparently lived in groups, as revealed by fossil evidence, which includes:

• many fossils found together in bonebeds (large deposits of bones of the same species in an area)

• fossilized trackways of many dinosaurs travelling together • large groups of fossilized nests grouped together.

Some dinosaurs grouped together for protection (like Hypsilophodon), and some for more effective hunting, like Velociraptor. The existence of herds can also suggest the necessity of seasonal migratory movements to feed such a large group of animals.

HERDS - SAFETY IN NUMBERS

Many plant-eating dinosaurs travelled in herds, feeding and perhaps nestirig and migrating together. The advantage of congregating in herds was primarily in protection against predators ( meat-~ating animals).

Many sauropods may have travelled in herds, as evidence from multiple trackways (fossilized footprints) suggests. The trackways also indicate that the

young sauropods travelled toward the center of the herd for protection.

~ A bonebed of about 100 Styracosaurus fossils was found in Arizona, indicating ~that they also travelled in herds. Protoceratops bonebeds have also been found. Other ceratopsians, like Triceratops, may have also travelled in herds.

~ Maiasaura fossils have been found in a huge group of about 10,000 animals. This strongly indicates herding behavior. These Maiasauras were buried in

U volcanic ash along with a field of nests and eggs. Other duck-billed dinosaurs (hadrosaurs like Parasaurolophus) may have also congregated in herds to feed, nest, and perhaps

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migrate.

*"ff A bonebed of about 20 Hypsilophodon fossils were unearthed together on the U Isle of Wight (an island off the coast of southern England).

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Other dinosaurs that may have have travelled in herds were Omithomimus .~ and Dryosaurus.

PACKS - BETTER HUNTING

Many meat-eaters hunted in packs, combining their strength in order to kill even larger prey.

~The deadly and intelligent Velociraptor may have hunted in packs, attacking ~ even very large animals. Other Dromeosaurids (the most intelligent dinosaurs),

I ike Deinonychus may have also hunted in deadly packs, attacking even huge sauropods and ankylosaurids.

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DINOSAUR OFFENSIVE WEAPONS AND MANEUVERS

Many dinosaurs were anned with built-in weapons that were used for killing and eating prey, for dealing with interspecies rivalry, or as protection from fellow carnivores (meat eaters). These included:

• Big, sharp, pointed teeth - Largest, sharp teeth of most carnivores are for tearing flesh from prey .

... - ..... --.- ..... --~ -~

i/··~:~::··~··---=-~~~~~:\. • ~~ ... ~\ Clawed feet - Many dinosaurs claws on feet and/or hands.

\...) Dromaeosaurids and Megaraptor had a huge retractible sickle-like claws on each foot.

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• Grasping hands with clawed fingers - good for catching and slashing prey. • Large size - Some dinosaurs, like Giganotosaurus and T. rex were so large that they

were at the top of the food chain, and could eat any animal that they could catch. • Speed and agility- In order to eat, a predator must catch its prey. The only surviving

J' ...... 'dinosaurs, the birds, evolved from the speedy, bird-like theropods .

• Modem-day birds have excellent good color vision; it is likely that the bird-like dinosaurs (advanced theropods like the coelurosaurs) also had color vision. This would have helped them find and catch their prey (just as hawks use their acute vision to spot prey).

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DINOSAUR DEFENSIVE WEAPONS AND MANEUVERS

Dinosaurs were armed with built-in defensive weapons and behaviors that were used for dealing with interspecies rivalry or as protection from carnivores (meat eaters). These

. included:

• Horns, Claws, and Spikes - Many dinosaurs had deadly, knife-like protuberances that were excellent protection from being eaten (for example, Triceratops

,.~~ -- ~.-':'.

~~7;:-·:ig· and Kentrosaurus~). Some sauropods had large thumb claws; these were especially prominent in the young and in juveniles.

• Large size - Some adult diplodocids (like Apatosaurus, Diplodocus, Supersaurus, etc.) and other dinosaurs were so large that only the hugest carnivores or packs of carnivores were a danger.

• Armored plating (bony plates fused into leathery skin) -.~ Ankylosaurids (like Euoplocephalus, Ankylosaurus, and Sauropel ta) were plated all over the tops and sides of their bodies. Even their eyelids had armor plating. Only their underbellies were unprotected. To kill an Ankylosaurid, a predator would have had to flip over a terribly heavy animal over - not an easy job.

• Thick, leathery skin - This would provide only a little bit of protection from predators with sharp, strong teeth like T. rex, Giganotosaurus, and Utahraptor.

• Head butting -~ Pachycephalosaurs (like Pachycephalosaurus, Stegoceras, Wannanosaurus, etc.) and other thick-skulled dinosaurs may used head butting to repel predators.

It had long been thought that Pachycephalosaur's thick domes may have been used for ramming rivals during tp.ating and dominance combat, for attracting mates, and as a last-ditch self-defense against predators. Paleontologist Mark Goodwin of the

1/26/00 12:02 PM

Din06aur Defense - Enchanted Learning Software http://www.EnchantedLeaming.com!subjectsldinosaurslanatomy/Defense.shtm) "

University of California at Berkeley has analyzed many pachycephalosaur skulls (including those ofPachycephalosaurus), finding no evidence of healed scars. Also, under close analysis, the thick skull bone is not rigid and solid, but porous and fragile when put under extreme pressure. "It's time to kill the myth ... It certainly wouldn't be in their own best interests to ram heads in a fight," said Goodwin "They would have killed each other, and a couple of bowling balls would hardly make good targets."

• Speed - "'Leaving a fight can be easier and safer than fighting.

• Bludgeon-like tail clubs -... Ankylosaurids (like Euoplocephalus and Ankylosaurus) had bony tail-clubs that could easily have been used for defense, which would have been useful for these lumbering, plated grazers. Also, some theropods, like Shunosaurus,Orneisaurus and maybe Mamenchisaurus had tail clubs for protection.

• Whip-like tail - Some people believe that sauropods ~ may have used their massive tails as a whip to lash at their attackers. This theory seems unlikely given the amount of physiological damage to tail tissue that would be caused by the sudden acceleration near the end of the tail (and the deceleration upon impact). Also, the large sauropods probably grazed on tree leaves, giving them no room to whip their tail around without hitting tree trunks and getting severe tail damage.

DINOSAUR DEFENSE ACTIVITY

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DINOSAUR REPRODUCTION

Very little is known about dinosaur courtship, rivalry, pairing and mating.

EGGS

Most dinosaurs hatched from ~ ,,'. The eggs were round or elongated with hard shells. These eggs were similar to those of reptiles, birds and primitive mammals; they contained a membrane, the amnion, that kept the embryo moist. Some dinosaurs may have have cared for their eggs, others may have simply laid them and then abandoned them.

Fossilized dinosaur eggs were first found in France in 1869. Many fossilized dinosaur ~ eggs have been found, at over 200 sites in the USA, France, Spain, Mongolia, China,

Argentina, and India. Very rarely, the eggs have preserved parts of embryos in them, which can help to match an egg with a species of dinosaur. Without an embryo, it it difficult to match an egg to a dinosaur species. The embryo in an egg also sheds light on dinosaur development.

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According to Dr. Kenneth Carpenter of the Denver Museum, most dinosaur eggshell still have the original shell, not a fossilized replica. "The slightest change in the calcite making up the shell destroys the very fine detail that can be seen with the scanning electron microscope. Amino acids have also been recovered that are very similar to those found in modem bird eggshell."

Recent Finds: About 1 0 large dinosaur eggs (plus 3 egg impressions) were found 1999 in southwestern France (near Albas, in the foothills of the Pyrenee Mountains). No bone fossils were found. The eggs had been buried in two layers in the sand. No one knows what type of dinosaur the eggs were.

Much larger egg sites have been found nearby, in northeastern Spain near Tremp, where hundreds of thousands of eggs (of both sauropods and theropods) have been found. Other huge dinosaur eggs sites have been found in Argentina and China.

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DINOSAUR EGG INFORMATION

nosaur Di Lengt h of Adult

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i25-30 feet (7.8-9 m)

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Where Were Fossils

Egg Shape, Size Egg Placement the Were Eggs in Found a Nest?

Fe=:~-~tion • Football-shaped, 1 foot I

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(30 cm) long, 10 inches (25 cm) wide,

France had a volume of5.8

I This was the first I dinosaur egg I No Group of5

I pints (3.3 liters), and I I I discovered and the I largest. I may have weighed up

__ I to 15.5poullds (7 kg)

r Potato-shaped, 6 I inches (15 cm) long

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Montana Oval, Grapefruit sized, 8 inches (20 cm) long

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I Iholes scooped out of ! 1 the ground, about I 16-7 feet (1.8-2 m) in

diameter, and about· 3.5 feet tall.

Newborns were i about a foot (0.3 m) II long. Nests were placed about 25-30

Yes I feet (7.6-9 m) apart, I just about the size I ofan adult ! Maiasaura. In l Montana, one group i of over 40 nests I i covers 2.5 acres (1 i hectare) of land that IWas an island during· i the late Cretaceous

I. !. l ! I period.

~---l-~-~e-s:-:-~;U-m-s-) -r~ll inch (2.5 cm) long F-grOUpF

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Djnosaur Anatomy - Enchanted Learning Software http://www.EnchantedLearning.comlsubjectsldinosaurslanatomy/Repro.shtmI

U NESTS

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Fossils of dinosaurs' burrows and nests can reveal a lot about their behavior. Nests vary from simple pits dug into the earth or sand to more complicated nests constructed with mud rims. They may appear in large groups or all alone. The nests and the clutches of eggs reveal information about the dinosaur's nurturing behavior.

• Eggs with embryonic Therizinosaurs (bipedal meat-eaters, a theropod from the late Cretaceous) were found in 1991 in central China.

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DINOSAUR TAILS

Most dinosaurs had large tails that probably had multiple uses, including acting as a:

• Counterbalance -:E~ most dinosaur tails counterbalanced a long neck or a large, heavy head. Until a few years ago, people thought that dinosaurs dragged their tails on the ground, serving to do little but making locomotion difficult. This seemed pointless and ignored the fact that the large mass at the front of the dinosaur's body (neck and head) had to be counterbalanced or else the animal would tip over!

• Tripod leg -~ The tails of some dinosaurs could be useful in attaining a tripod stance, which was probably used to forage very tall vegetation and for mating.

• Help in turning quickly -~ Some dinosaurs needed to run speedily and to be able to turn quickly, either to catch prey or avoid predators. In order to tum quickly while running, the tail's movement can shift the runner's direction, allowing swift turns.

• Bludgeon for protection -~ Ankylosaurids (like Euoplocephalus and Ankylosaurus) had bony nodules at the end of their tails that could easily have been used for defense, which would have been useful for these lumbering, plated grazers. Also, some theropods, like Shunosaurus, Omeisaurus and maybe Mamenchisaurus had tail clubs for protection.

• Whip for protection - '"''' -==>In 1961, the British zoologist R. McNeill Alexander proposed the idea that some sauropods may have used their massive tails as a whip to lash at their attackers. This theory seems unlikely given the amount of physiological damage to tail tissue that would be caused by the sudden acceleration near the end of the tail (and the deceleration upon impact). Also, the large sauropods

1/26/00 II :09 AM

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probably grazed on tree leaves, giving them no room to whip their tail around without hitting tree trunks and getting severe tail damage. In addition, the amount of time to get a nerve message from the head to the base of the tail (a distance of up to 50 feet, 15 m) would delay the attack considerably. Nerve impulses in humans travel at around 3 - 4 meters/second. If dinosaurs could match this rate of transmission, the time for a nerve impulse to travel from the head to the base of the tail would be about 4 - 5 seconds. Add to this the time to start the whip-like motion and the swift meat -eater would probably already have taken a big bite of Diplodocus.

• Prehensile appendage - Some people theorize that some dinosaur tails may have been prehensile, able to manipulate objects. The tails may have been used to build nests, move vegetation, etc., much as an elephant's trunk works .

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BRAINS AND INTELLIGENCE

The EQ or Encephalization Quotient is a simple way of measuring an animal's intelligence. EQ is a ratio of the mass of an animal's brain to the mass of its body. Assuming that smarter animals have larger brains to body ratios than less intelligent ones, this helps determine the relative intelligence of extinct animals. In general, warm-blooded animals (like mammals) have a higher EQ than cold-blooded ones (like reptiles and fish).

Dumbest Dinosaurs: The primitive dinosaurs belonging to the group sauropodomorpha (which included Massospondylus, Riojasaurus, and others) were among the least intelligent of the

U dinosaurs, with an EQ of about 0.05.

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Smartest Dinosaurs: The Troodontids (like Troodon) were probably the smartest dinosaurs, followed by the dromaeosaurid dinosaurs (the "raptors," which included Dromeosaurus, Velociraptor, Deinonychus, and others) had the highest EQ among the dinosaurs, about 5.8.

EQ • Encephalization Quotient 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 5.8

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The Encephalization Quotient was developed by the psychologist H. J. Jensen in the 1970's.

A SECOND BRAIN?

I t used to be thought that the large sauropods (like Brachiosaurus and Apatosaulus) and the omithischian Stegosaurus had a second brain. Paleontologists now realize that what they thought was a second brain was an enlargement in the spinal cord in the hip area, perhaps containing fat and nerve tissue. This nerve center may have controlled the animal's hind legs and tail and was larger than the animal's tiny brain .

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DINOSAUR ANATOMY AND BEHAVIOR ~oc...... __ ':'-"-?,,....,, __

~W~lru~~1 Reproduction, Nests ~~= &E

SEXUAL DIMORPHISM

It is very difficult to determine which fossils were male and which were female. Some paleontologists have theorized that the males of some species may have had larger crests, frills, or other showy structures that were used in courtship displays, mating rituals, and/or intraspecies rivalry (contests among members of the same species, like territorial disputes and mating competition), very much like many modem-day animals. The development of these structures occurs with sexual maturity, so example of juvenile fossils would have little or none of these structures.

• ~Hadrosaurs Originally, fossils very similar to Parasaurolophus but with smaller U crests were thought to belong to a separate species of Parasaurolophus. A similar

situation existed for Lambeosaurus and many other crested dinosaurs (the lambeosaurine duck-bills) and dome-headed dinosaurs (Pachycephalosaurs). In 1975, the Canadian paleontologist Peter Dodson showed that many of the supposedly separate species of frilled/crested dinosaurs were the females and juveniles of the species. The anatomist James A. Hopson also interpreted the crest and dome sizes as differing in males and females within a species.

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Ceratopsians - Many paleontologists believe that the ceratopsians (like Triceratops and Protoceratops) used their horns and frills in territorial disputes, in mating competitions and for attracting females.

• ~ Pachycephalosaurs, the dome-headed hadrosaurid dinosaurs, also exhibit sexual dimorphism. The anatomist James A. Hopson realized that crest and dome size differs in the male and female of the species.

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DINOSAUR SKIN

COLOR ~ ) No one mows what colors or patterns the dinosaurs were. The largest of

... ~ dinosaurs (like the giant sauropods) were probably neutral-colored or grey, like the largest animals today (eg. elephants).

Most likely, dinosaurs that were hunted for their meat were camouflaged in order to hide somewhat from the predators, colored in a particular fashion to attract mates, or brightly colored to let predators mow that they taste awful. Different colors are also important in temperature regulation; they absorb (or reflect) sunlight as the animal controls its body

~ temperature.

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TEXTURE ( AIJlfDinosaurs had bumpy skin, as much fossil evidence indicates. A bumpy T. rex ...-,r" skin imprint was found by a 12 year old.

~ The ankylosaurids had bony plates fused into their leathery skin, which was ~ excellent protection from predators.

INSULATION AND THE BEGINNING OF FLIGHT /~Some bird-like dinosaurs had proto-feathers. Newly found dinosaurs include: !'

• Sinosauropteryx prima - (121-135 million years ago). Sinosauropteryx had a coat of downy feather-like fibers that are perhaps the forerunner of feathers. This ground-dwelling dinosaur had short arms, hollow bones, a three-fingered hand, and was about the size of a turkey.

• Protarchaeopteryx robusta - Long, symmetrical feathers on arms and tail, but it probably could not fly - the size ofa turkey (from China, 121-135 mya) .

• Caudipteryx zoui - a small, very fast runner covered with primitive (symmetrical and therefore flightless) feathers on the arms and tail, with especially long ones on the tail. About the size ofa turkey. (from China, 121-135 mya)

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DINOSAUR LIFE SPAN

How old did the dinosaurs get to be? That question is very hard to answer.

6if: ~ecently scientists have found t~at most dinosaur bones have ~owth r~ngs (called ":\:0/ hnes of arrested growth, abbrevIated LAG) that may answer thIS questIon. These

lines are only visible using a microscope. The bones have to be sliced into thin section and viewed with a polarized lens in the microscope. It's a bit like looking at the growth ring of trees to determine the age of a tree. Each year of growth leaves a trace in the bone (or tree trunk).

U Scientists have determined that:

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• Troodon- Weight: 50 kg; 3-5 years to reach adult size (Varricchio, 1993). • the ceratosaur Syntarsus rhodesiensis - Weight: 25+ kg; 7-8 years to reach adult size

(Chinsamy, 1994). • the prosauropod Massospondylus carinatus~- Weight: 250+ kg; 15 years to

reach adult size (Chinsamy, 1994). • the sauropod Bothriospondylus madagascariensis - weight 17500 kg; 43 years to adult

size (Ricqles, 1983) • the ceratopsian Psittacosaurus mongoliensis - weight 80 kg; was 10 to 11 years old

(Erickson and Tumanova, unpublished data)

Another way to estimate life span is based on body size, the known life spans of modem-day animals, and the fact that large animals generally live longer lives than smaller ones. It has been estimated that the huge sauropods, like Apatosaurus, Brachiosaurus, Diplodocus, and Supersaurus lived to be about 100 years old. Smaller dinosaurs probably lived shorter life spans.

Growth Rates: Growth rates based on maximum growth rates of modem-day reptiles, even though there are probably major metabolic differences. Protoceratops: Adult 177 kg, hatchling 0.43 kg

1/26/00 II :08 AM

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(hatchling weight calculated to be about 90% of the weight of 0.5 liter egg). Age to adulthood calculated to be roughly 26-38 years.

U Hypselosaurus : Adult 5300 kg, hatchling 2.4 kg. Age to adulthood calculated to be about 82-188 years.

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ZoomDinosaurs.com DINOSAUR ANATOMY AND BEHAVIOR

HOT-BLOODED OR COLD-BLOODED?

• Hot-blooded animals (homeotherms) generate heat internally and maintain a relatively constant body temperature (higher than the average temperature of the environment). Examples include the mammals (including people) and birds. A related term is endothermy, meaning that an organism generates their own heat to maintain body temperatures.

• Cold-blooded animals (poikilotherms) have a body temperature that changes with external conditions. Examples include reptiles, who need to sun themselves in the morning to warm up, and then protect themselves in the midday heat. A related term is ectothermy, meaning that an organism uses external heat sources (and heat sinks) to regulate its body temperature.

The debate about whether dinosaurs were hot- or cold-blooded is quite controversial. It used to be assumed that dinosaurs were cold-blooded like their reptile ancestors. Some paleontologists have recently argued that at least some dinosaurs were fast, active, competed against hot-blooded mammals, lived in cool areas, were related to birds, and therefore were endothermic (generating their own body heat, or hot-blooded).

Dinosaurs evolved from cold-blooded animals (the reptiles) and evolved into warm-blooded animals (the birds). All dinosaurs, however, were not the same, and perhaps their physiologies differed also. The huge dinosaurs and the tiny dinosaurs might have used different heat-regulation strategies, just as they used different strategies for other aspect of living. A good argument for this is found among modem mammals. Although warm-blooded, there are some mammals (monotremes, the egg-laying mammals like the duck-billed platypus) whose metabolisms are close to being cold-blooded.

Some dinosaurs seem to have had heat regulating structures on their bodies. For example, Spinosaurus and Ouranosaurus had large sails on their backs, and Stegosaurus had numerous plates. These devices were probably used for the collection and dispersion of heat. This suggests that they needed these structures to regulate their body heat and that they were cold-blooded.

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Basically, it's difficult or perhaps impossible to answer this Question with today's lmowledge. There are a lot of people thinking about this, and we'll be hearing a lot more about it soon.

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