GEO 102 Lecture 31 Outline of Last Lecture I. Orbital ChangesOutline of Current Lecture II. ExtinctionIII. Mesozoic- “The Age of Reptiles”IV. What is a Dinosaur?Current 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 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- iridiumCaused radical changes to global
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