EARTH 7 Lecture Notes - Lecture 15: Herrerasaurus, Bipedalism, Convergent Evolution
Document Summary
Note taker: deanna coughlin (714) 235-7896; deannajasmine@yahoo. com lecture 16: The triassic: dinosaurs evolve on pangaea, not very diverse, other groups go extinct. The jurassic: dinosaurs become dominant on land as pangaea splits. The cretaceous: peak of dinosaur diversity as landmasses become even further divided. Patters in the fossil record can be influenced by: Paleontologists do what they can with what they got. Formation of pangaea: interior of contents much drier. Fewer barriers to dispersal in the triassic. Triassic becomes much hotter, partly due to pangaea formation remember synapsid diversity declined severely during the end-permian mass. Extinction, but few surviving groups rebounded quite well. Archosaurs diversify in the triassic many of these are ancient croc relatives (but not all) First dinosaurs appear in the mid triassic herrerasaurus: ~230 ma (mid triassic), argentina; one of earliest known dinosaurs; small; bipedal. Iclicker: what is the dinosaur in the center of this drawing:
