INTEGBI C13 Lecture 18: Integrative Bio C13 Lecture 18
10 Nov 2016
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Document Summary
Dimetrodon: more closely related to mammals than to dinosaurs. Most major groups arose in a short interval in the triassic (~245-210 mya) Extinction is a dominant feature of the history of life. Hypothesized cause: major glaciation dropped sea-level, draining shallow tropical seas present at the time. Loss of species largely driven by a decreased origination rate, not an increased extinction rate. Hot spots: where mantle plumes penetrate the crust. Giant mantle plumes erupt onto the surface (large igneous provinces) Some groups had 90% extinction, the average was 56% Siberian traps erupted at the end of the permian- would have covered california with molten rock to a depth of 1. 5 to 6 miles. They passed through coals and limestones, releasing huge volumes of co2. Loss of species largely driving by a decreased origination rate, not an increased extinction rate. Central atlantic magmatic province (camp) dates to the end-triassic, as the atlantic opened.
