Middle Ordovician
General info
| Belongs to |
Ordovician
|
| Type | chronostratigraphy |
| Rank | Series |
| Scope | global |
| Status | informal standard |
| Age top (Ma) | 458.4 |
| Age base (Ma) | 470 |
| Index | O2 |
| Alt. index | O2 |
| Date added | 2003-03-23 |
| Date changed | 2022-11-04 |
| Stratigraphy | Index | Index add'l | Type | Rank | Scope | Belongs to | Age base (Ma) | Age top (Ma) | Age |
|---|---|---|---|---|---|---|---|---|---|
| Volkhov Stage | BII | O2VL |
chronostratigraphy
|
Stage
|
regional
| Ontika Subseries | 471.8 | 467.5 |
Middle Ordovician
|
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