GEOL 11042 Lecture Notes - Lecture 31: Western Interior Seaway, Photosynthesis, Mantle Plume
8 Nov 2020
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Document Summary
The global extinction event that marks the end of the cretaceous and the end of the. The extinction event included: dinosaurs, pterosaurs, marine reptiles, most surface ocean plankton, many tropical and subtropical plants and animals. Two possible causes of the cretaceous-paleogene extinction event. Today, we will look at the two current hypotheses on the causes of the cretaceous- To do this, we will focus on two very different areas of the world: the meteorite crater known as the chicxulub crater, on the edge of the yucatan. Peninsula: the deccan traps flood basalts, located in western india. What defines the global cretaceous-paleogene boundary: a boundary clay with a spike of the heavy metal iridium, a lot of carbon-12, the mass extinction of about 90% of surface ocean plankton. Evidence that indicates the occurrence of a meteorite impact. Iridium a heavy metal associated with meteorites, but rare in the earth"s crust.
