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 Cambrian period contained an enormous burst of evolution, known as the "Cambrian Explosion". In the early Cambrian the seas contained a huge variety of soft-bodied, mobile creatures, such as this worm Ottoia prolifica from the Burgess Shale collection. By the end of the Cambrian a range of hard-shelled creatures such as molluscs had evolved, suggesting the presence of predatory animals.

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