Floian (jan 1, 477100000 BC – jan 1, 471300000 BC)
Description:
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.Added to timeline:
Date:
jan 1, 477100000 BC
jan 1, 471300000 BC
~ 5803853 years