Tremadocian (1 gen 486850000 anni a. C. – 1 gen 477100000 anni a. C.)
Descrizione:
The Tremadocian is the lowest stage of Ordovician. Together with the later Floian Stage it forms the Lower Ordovician Epoch. The Tremadocian lasted from 486.85 to 477.1 million years ago. The base of the Tremadocian is defined as the first appearance of the conodont species Iapetognathus fluctivagus at the Global Boundary Stratotype Section and Point (GSSP) section on Newfoundland.Aggiunto al nastro di tempo:
Data:
1 gen 486850000 anni a. C.
1 gen 477100000 anni a. C.
~ 5883516 years