This essay on mass extinction events (Ordovician, Devonian, Permian, Triassic, Cretaceous) in the geologic record is a chapter from History of Life, a book written by Richard Cowen, in which he discusses the general geologic body of knowledge surrounding each mass extinction event. Additionally, the author provides thirty-two (32) bibliographic references (primarily peer-reviewed science journals) on these mass extinction events.
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