01:460:206 Lecture Notes - Lecture 15: Carnosauria, Stegosauria, Coelophysoidea
9 Sep 2019
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Document Summary
Breakup of pangea: end of triassic rifting began, ~210 ma, formation of proto-atlantic. A new extinction: end-triassic mass extinction, dinosaurs became dominant life form, most marine reptiles except ichthyosaurs and pleisosaurs, protomammals, many archosaurs (except crocodilians, pterosaurs, and dinos, volcanism (central atlantic magmatic province), impact, methane hydrate release. Life in the jurassic period (~199-145 ma: marine reptiles, pterosaurs, mammals, and dinos continued to flourish, golden age of the dinosaur world , other large carnivores and herbivores were gone. Geography and climate: animals similar throughout world (still supercontinent, dinos began to change by mid-jurassic. Late marine life: reef builders, primitive sharks, squidlike creatures. Cretaceous: at start, life very similar to jurassic, by end, had many types of plants and animals present today. Early cretaceous: evolution of angiosperms, flower plants, flowering = means of reproduction, early k small weedy plants, late k flowers.
