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

Much of our evidence for this period comes from rocks in Canada's Yoho National Park known as the Burgess Shale.

Over 70,000 exquisitely preserved fossils such as this worm Ottoia prolifica have been collected from this site, and together they provide a remarkable window into life in the Cambrian.

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