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Life in the Mesozoic
The Age of Dinosaurs
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Mesozoic Life Highlights
• Oceans repopulated with “Modern Fauna”
• Dominant land animals - Dinosaurs• First Flowering Plants & Social Insects
• First Mammals• First Birds• Two Mass Extinctions(end-Triassic and end-Cretaceous)
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What’s Happening in the Oceans?
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PhytoplanktonErupt
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Paleozoic vs. Mesozoic
Rugosa & Tabulata Corals
Hexacorals
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Reefs - Hexacorals
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Reefs - Rudists
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Paleozoic vs. Mesozoic
Brachiopods Bivalves & Gastropods
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Inoceramids
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Paleozoic vs. Mesozoic
Crinoids Echinoids (Sea Urchins)
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Paleozoic vs. Mesozoic
Trilobites Crustaceans
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Life was Adapting to Major Marine Predators
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Ammanoids - Parapuzosia
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Bony Fish - Xiphactinus
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Marine Reptiles
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Placodonts
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Plesiosaurs:
Elasmosaurus
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Kronosaurus
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Ichthyosaurus
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Mosasaurus
Largest-150 ft long!
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Marine Reptile Relatio
ns
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Giant Sea Turtles
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The “Green Report”
Flower Power Add Color to the Earth
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Angiosperms
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First Flowers
Magnolia
Cretaceous Flower
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Flowers and Insects
Cretaceous
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Paleozoic vs. Mesozoic
Large Amphibians Frogs and Salamanders
Paracyclotosaurus
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Triassic Frogs
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Mesozoic Reptiles
Synapsids(Mammals)
Anapsids(Turtles)
Diapsids
Lizards& Snakes
Crocodiles
Pterosaurs
MarineReptiles
Dinosaurs& Birds
Archosaurs
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Archosaurs:
Early Diapsids
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Big Dinosaur Questions
• What are Dinosaurs?• How do we understand Dinosaur behavior?
• Where dinosaurs warm-blooded (endotherms) or cold-blooded (ectotherms)?
• Did birds evolve from dinosaurs?• What caused the extinction of the dinosaurs?
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Dinosaurs vs. “Reptiles”
1.Upright posture Legs beneath the body rather than to the side
2.Unique arrangement of ankle hinge (and other skeletal differences)
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The 2 Major Lines of Dinosaurs
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Critters Gallery
critters.pixel-shack.com
Russel Gooday & John Hughes
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Ornithischia“Bird-Hipped Dinosaurs”
1.Stegosaurs2.Hadrosaurs3.Ankylosaurs4.Pachycephalosaurs5.Ceratopsids
All Herbivores
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Hadrosaurs - “Duck-billed Dinosaurs”
Ouranosaurus
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Hadrosaurs
Parasauralophus
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Hadrosaurs
Maiasaurus
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Laellynasaura
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Stegosaurs
Stegosaurus
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Ankylosaurids - Natures Tanks
Euoplocephalus
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Ankylosaurids
ankylosaurus
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Pachycephalosaurs - “Bone Heads”
Pachycephalosaurus
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Ceratopsids
“Horned Dinos”
Torosaurus
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Ceratopsids
Triceratops