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 creatures present in the later stages of the Cambrian have been described as exhibiting levels of increased specialization. For example, some animals were active predators, such as starfish, whereas others, such as this coral, remained fixed to the sea floor and fed on food particles suspended in the water.

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