agenda 4/18 we will start a project that counts as a test grade on monday! unit test is 4/28!...
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Agenda 4/18We will start a project that counts
as a test grade on Monday!Unit test is 4/28!Warm-Up: How old do you think
the Earth is?Geologic Time NotesGeologic Timeline Activity
Phanerozoic eon
“Visible Life”Paleozoic Era: old lifeMesozoic Era: middle lifeCenozoic Era: recent life
Geologic Time scale4.6 billion years are divided into
big chunks of time called Eons.Eons are divided into smaller
time periods called Eras. The 3 eras are Paleozoic,
Mesozoic, & Cenozoic.Eras are divided into smaller
time periods called Periods.Periods are further divided into
Epochs.
Precambrian PeriodPrecedes the Cambrian PeriodAccounts for 88% of geologic
timeNot too much known about this
period, and what is has been discovered within the last 50 years
Not many fossils found in this period due to the changing of rocks (metamorphose)
Paleozoic Era570 mya to 225 mya(November and part of December
on our calendar)Longest of the three eras in this
eon
A time of ChangeThis was a time of dramatic
geological, climatic and evolutionary change
Cambrian period: witnessed the most rapid and widespread diversification of life in Earth’s history! (Cambrian explosion)
Life began in the ocean, then transitioned on land
By the end of this era it was dominated by various animals
Paleozoic Era: Common AnimalsTrilobites were common animalsSea scorpions (2 m).Land plants appeared in middle
Paleozoic.Sharks, rays, and bony fish
existed.Tropical jungle like forest were
prevalent by the end of the era.Insects (some huge) were the
predominant animals.
Permian Period
Devonian Period
Cambrian Period
Mesozoic Era225 mya – 65 mya (Mid
December)“Age of the Reptiles”Dinosaurs roamed Earth. (mainly
non-avian)Birds and mammals started
evolving during the last part of the Mesozoic.
This era began and ended with two mass extinctions: Permian-Triassic event, Cretaceous-Paleogene event
Mesozoic Era
Cenozoic EraRecent Life (65 mya to present)
(Last few days on our calendar.)“age of mammals”Ice Age began 3 mya Took 75000 years to form, stayed
10000 years, then retreated.Man evolved during this time
periodPaleogene, Neogene, Quaternary
(periods)
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