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

Jawed fish, such as this modern salmon, first appear in the Silurian. The jaws probably evolved from the gill arches of jawless fish, and were an important evolutionary step for fish, enabling them to eat new types of food and fight off predators.

Previous Next