Upper Ordovician
General info
Belongs to |
Ordovician
|
Type | chronostratigraphy |
Rank | Series |
Scope | global |
Status | formal standard |
Age top (Ma) | 443.8 |
Age base (Ma) | 458.4 |
Index | O3 |
Alt. index | O3 |
Date added | 2003-03-23 |
Date changed | 2022-11-04 |
Browse Geocollections