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 |
Reference | Content | Year1 | Pages | Remarks |
---|---|---|---|---|
Gradstein et al., 2004 |
2004
| |||
Gradstein et al., 2012 |
2012
| 603-608 | ||
Goldman et al., 2020 |
2020
| 630-694 |
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