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

The fossil record suggests that a massive extinction took place towards the end of the Ordovician, possibly through climatic changes. While the intense evolutionary activity of the Cambrian and Ordovician periods took place within relatively stable conditions, the mass extinction seems to coincide with a sudden global cooling.

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