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 climate in the Devonian was very warm. Rivers and lakes dried up and vast swamps appeared. This affected the course of evolution. The stagnant, swampy water was not a good source of oxygen, and this favored the development of lungs in some fish, which enabled them to gulp air from the surface.

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