The late devonian extinction was one of five major extinction events in the history of life on earth a major extinction the kellwasser event occurred at the boundary that marks the beginning of the last phase of the devonian period the famennian faunal stage about 376 360 million years ago overall 19 of all families and 50 of all genera became extinct a second distinct mass extinction the hangenberg event closed the devonian period although it is clear that there . Pdf chapter to wileys encyclopedia of life sciences the late devonian mass extinction which occurred au1 3719 one million years ago ma is find read and cite all the research you . The late devonian mass extinction which occurred 3745 ma is one of the big five mass extinctions in earth history suggested causes of the mass extinction include oceanic anoxia and global cooling. This is what happened in the late devonian a geologic period lasting 465 359 million years ago the devonian began with a flourishing of life and genetic diversity and ended with mass extinction
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