GEO 102 Lecture 28 Outline of Last Lecture I Major Paleozoic Events and Coal Outline of Current Lecture II Extinction III Mesozoic The Age of Reptiles IV What is a Dinosaur V Cenozoic Life Current Lecture Extinction Permo Triassic o 95 of marine life gone o 70 of all terrestrial life gone 4 other big extinction events o Many smaller extinction events o Often coincident with geological periods Mesozoic 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 superficially What 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 found These 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 environment Cenozoic Evolution Flowering plants started in Cretaceous o A new very effective way of reproducing Mammals o They have been around since the Triassic o Started small and similar to rodents Birds o A direct offshoot of theropods Cenozoic Life Marine life looks modern Plants look modern Mammals dominate o But many mammals do not look at all familiar New organisms in the same old niches o Reef building corals Human 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 cousin
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