Floian (1 ene 477100000 año aC – 1 ene 471300000 año aC)
Descripción:
The Floian is the second stage of the Ordovician Period. It succeeds the Tremadocian with which it forms the Lower Ordovician series. It precedes the Dapingian Stage of the Middle Ordovician. The Floian extended from 477.1 to 471.3 million years ago. The lower boundary is defined as the first appearance of the graptolite species Tetragraptus approximatus.Añadido al timeline:
fecha:
1 ene 477100000 año aC
1 ene 471300000 año aC
~ 5803853 years