Floian (1 gen 477100000 anni a. C. – 1 gen 471300000 anni a. C.)
Descrizione:
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.Aggiunto al nastro di tempo:
Data:
1 gen 477100000 anni a. C.
1 gen 471300000 anni a. C.
~ 5803853 years