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30.3/30.4 The Mesozoic (middle and recent history)

30.3/30.4 The Mesozoic (middle and recent history). Mesozoic. Main factors of the Mesozoic Milder climate Oceans were 10 degrees or warmer Evidence suggest that there was no glacial ice at the poles. Dinosaurs dominated and went extinct (hey, heey HEY, HEEEY H, H HEEY, H, H Hey, Heeey)

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30.3/30.4 The Mesozoic (middle and recent history)

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  1. 30.3/30.4 The Mesozoic (middle and recent history)

  2. Mesozoic Main factors of the Mesozoic • Milder climate • Oceans were 10 degrees or warmer • Evidence suggest that there was no glacial ice at the poles. • Dinosaurs dominated and went extinct (hey, heey HEY, HEEEY H, H HEEY, H, H Hey, Heeey) • Appearance of new ssp.

  3. Mesozoic Triassic Period • Lasted from 248 mil - 206 mya • Ammonites (Cephalopods) are important index fossils. Went extinct by the end of the period. • Plants included • Tree ferns, Spore bearing ferns and rushes

  4. Mesozoic Triassic Most of the Triassic, land was joined in one supercontinent. Then eventually broke up. • Pangea (all continents joined) • The northern part, Laurasia contained what is now N. America and Eurasia. • The rest of the continents started out as the continent Gondwanaland.

  5. Mesozoic Jurassic • 206-144 mya • Many types of dinos appeared • The famous Archeaopteryx and Protoavis • Transition fossil for birds • The appearance of the first true mammals. • Cycads and conifers were abundant. • Some present day bodies of water formed • The North and south Atlantic

  6. Mesozoic Cretaceous • 144-65mya • Dinos often exceeded 25m • Appearance of flowering plants • Rocky Mnt Oregeny and re-elevation of the Appalachians • Mass extinction • 50% of plants and animals went extinct • Large asteroid struck 65 mya sending dust into the atmosphere. • Struck near present day Yucatan Peninsula • Carcharodontosaurus was probably largest meat eater.

  7. Earth Recent History The Cenozoic Era • Started 65mya • Most recent era • Rise of the mammals • Modern plants evolve • Climate was warm and humid • Continents came to present day position • Rise of the hominids (bipeds) bout 2-3my on earth. • Australopithecus oldest • Homo Habilus (tools) 1.5-2 mya • Homo Erectus 1.5 mya • Homo Sapiens twice 300,000-400,000 ya

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