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Unformatted text preview: Lecture 20 3/1/10 Dinosaur Extinction K/T worst (dinosaur extinction), end Permian second worst What was the world like near the K/T boundary? Sea level curve- During age of dinosaurs, sea level not high in beginning, but increased dramatically near end (Triassic Cretaceous) Temperature- Greenhouse was extreme (warmest time ever in history of life)- Decreased a little near end of cretaceous, but upped again Continent- Lots of water, many areas flooded- Shallow coastal water (good for biodiversity) What is the evidence of bolide impact? Impact evidence- Iridium- Shocked quarts- Spherule and tektite- Crater Iridium- Gubbio, Italy- Concentrated carbon (K/T boundary): the black line between age of dinosaurs and after- Iridium skyrockets to an unusual level on this boundary, but drops down after- Either bring it from outer space (extraterrestrial) but from deep in the earth (huge volcanism) Shocked quartz- Quartz not just beautiful, but really hard; to alter the structure, must apply a lot of force...
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This note was uploaded on 08/30/2011 for the course GEL 3 taught by Professor Motani,r during the Spring '08 term at UC Davis.
- Spring '08