moritz11 - Bio1B Evolution 10 Last lecture: Species &...

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Bio1B Evolution 10 Last lecture : Macroevolution: – The fossil record, extinctions and major transitions Today Fossil record (cont). [Text Pp. 521-524] Mass extinctions - the Cretaceous/Paleogene (“K/T”) Transitional forms Terrestrial vertebrates (tetrapods) Evolution of development programs [Text Pp. 525-530] The eye, vertebrate limbs 2 The big 5 mass extinctions Evidence from analyses of extinction (red) and blues (diversity) or families of marine invertebrates Permian-Triassic - 96% species extinction, 8/27 orders of insects; Volcanism in Siberia? Cretaceous-Paleogene (“K/T”), 65 Myr - demise of radiation 3 The asteroid impact Alvarez, UC Berkeley (see Science, 5th March, p1214) Faunal turnover Carbon cycle change Iridium spike
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moritz11 - Bio1B Evolution 10 Last lecture: Species &...

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