After International Comission on Stratigraphy, 2004
Period |
Epoch |
Age |
ended: |
becan: |
|---|---|---|---|---|
O |
Late Ordovician |
Hirnantian |
443.7 ± 1.5 Ma | 445.6 ± 1.6 Ma |
| [“Ashgillian”] | 445.6 ± 1.6 Ma | 455.8 ± 1.6 Ma | ||
| [“Caradocian”] | 455.8 ± 1.6 Ma | 460.9 ± 1.6 Ma | ||
Middle Ordovician |
Darriwilian |
460.9 ± 1.6 Ma | 468.1 ± 1.6 Ma | |
[“Llanvirnian”] |
468.1 ± 1.6 Ma | 471.8 ± 1.6 Ma | ||
Early Ordovician |
[“Arenigian”] |
471.8 ± 1.6 Ma | 478.6 ± 1.7 Ma | |
Tremadocian |
478.6 ± 1.7 Ma | 488.3 ± 1.7 Ma |
Reference(s):
- International Commission on Stratigraphy: 2004: International Stratigraphic Chart.
–International Union of Geological Sciences: International Commission on Stratigraphy, Paris, 2003
[http://www.stratigraphy.org/]