Ordovician
| Belongs to | Paleozoic |
| Type | chronostratigraphy |
| Rank | System |
| Scope | global |
| Status | formal standard |
| Author | Lapworth |
| Year | 1879 |
| Etymon | Ordovices, a northen Celtic Welsh tribe |
| Age top (Ma) | 443.8 |
| Age base (Ma) | 485.4 |
| Age (Ma) | Paleozoic |
| Index | O |
| Alt. index | O |
| Date changed | 2022-11-04 |
Locality | Type | From (m) | To (m) | Reference | Remarks | |
|---|---|---|---|---|---|---|
| Green Point Section, western Newfoundland | boundary stratotype | 101.8 | Cooper et al., 2001 | GSSP for the Tremadocian Stage |
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