Blackwell Publishing
Precambrian Paleozoic Mesozoic Cainozoic
Cambrian 590 MYRBP Ordovician 438 MYRBP Silurian 438 MYRBP Devonian 408 MYRBP Carboniferous 360 MYRBP Permian 286 MYRBP

Another mass extinction seems to have taken place at the end of the Devonian. It is not at all clear what factors were responsible for this event, although many authors contend that sudden global cooling was a main factor. However, cooling occurs in other periods without significant levels of extinction, suggesting that other factors may be operating.

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