GEO 102 Lecture 31 Outline of Last Lecture I Orbital Changes Outline of Current Lecture II Extinction III Mesozoic The Age of Reptiles IV What is a Dinosaur 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 More missing links 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 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
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