GEO 102 Lecture 28 Outline of Last Lecture I. Major Paleozoic Events and Coal Outline of Current Lecture II. ExtinctionIII. Mesozoic- “The Age of Reptiles”IV. What is a Dinosaur?V. Cenozoic LifeCurrent LectureExtinction - Permo-Triassic o 95% of marine life goneo 70% of all terrestrial life gone- 4 other big extinction eventso Many smaller extinction eventso Often coincident with geological periodsMesozoic-“The Age of Reptiles”- Although reptiles evolved in the late Paleozoic they became the dominant land fauna in the Mesozoic- Dinosaurs are only one type of large reptiles common then-there were many tohers that look like them superficiallyWhat is a Dinosaur?- Pelvic girdle- Strong evidence some were warm blooded- Laid eggs (some hatched them inside body)Birds and Dinosaurs- Pterodactyl was a bird-like dinosaur. - Many fossils that have both bird and reptile characteristics have been foundThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- More “missing links” Extinction - Mesozoic ended by another extinction - 2nd biggest (~70%- most terrestrial)- Caused in part by meteorite impact(s)o Also Deccan Trap eruptions- Left a chemical signature- iridium- Caused radical changes to global environmentCenozoic Evolution- Flowering plants (started in Cretaceous)o A new very effective way of reproducing- Mammalso They have been around since the Triassico Started small and similar to rodents- Birdso A direct offshoot of theropodsCenozoic Life- Marine life looks modern- Plants look modern- Mammals dominateo But many mammals do not look at all familiar- New organisms in the same old nicheso Reef building coralsHuman Evolution- We share about 90% of our genes with chimpanzees- We DID NOT EVOLVE FROM CHIMPS OR ANY OTHER APE!- We share ancestry with the great apes, and chimps are our closest
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