Famennian

The Famennian is the latter of two faunal stages in the Late Devonian epoch. It lasted from 372.2 ± 1.6 million years ago to 358.9 ± 0.4 million years ago. It was preceded by the Frasnian stage and followed by the Tournaisian stage.

It was during this age that tetrapods first appeared. In the seas, a novel major group of ammonoid cephalopods called clymeniids appeared, underwent tremendous diversification and spread worldwide, then just as suddenly went extinct.