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

One of the dominant forms of life in the Ordovician were Trilobites, which first appeared in the Early Cambrian but underwent rapid radiation in the Early Ordovician.

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