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Unformatted text preview: ition) • Distinctive fossils or assemblages of fossils can be used to correlate widely separ-ated rocks as being the same age. Shelly maine fossils and microfossils, and pol-len are usually best. Lingo • Species: a population of organisms that can interbreed to produce fertile offspring. • Genus: a collection of one or more species (pl. Genera) • Gradualism, uniformitarianism: biological and geological changes happen very slowly through time. 5 major mss extinctions (three of interest): • Permo-triasic, 250 Ma - made way for ancestors of dinos. • End-Triasic, about 200 Ma - took out last of large archosaur competition to the di-nos • K-T, 65 Ma, took out dinos Proposed causes of dino extinction • out-competed by smarter, egg-eating mammals • disease • falling sea level • volcanically driven climate change • astroid strike...
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This note was uploaded on 04/03/2008 for the course GEOS 216 taught by Professor Richardthompson during the Spring '08 term at Arizona.
- Spring '08