Berriasian

In the geologic timescale, Berriasian is an age of the Lower Cretaceous epoch of the Cretaceous period of the Mesozoic era of the Phanerozoic eon that is comprehended between 145 million 500 thousand and 140 million 200 thousand years ago, approximatedly. The Berriasian age succeeds the Tithonian age of the Upper Jurassic epoch of the Jurassic period of the same era and precedes the Valanginian age of the Lower Cretaceous epoch.