Ordovician
General info
| 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 |
Stratotypes
| Locality | Type | From (m)1 | To (m)2 | Reference | Remarks |
|---|---|---|---|---|---|
| Green Point Section, western Newfoundland |
boundary stratotype
| 101.8 | Cooper et al., 2001 | GSSP for the Tremadocian Stage |
| Stratigraphy | Index | Index add'l | Type | Rank | Scope | Belongs to | Age base (Ma) | Age top (Ma) | Age |
|---|---|---|---|---|---|---|---|---|---|
| Lower Ordovician | O1 | O1 |
chronostratigraphy
|
Series
|
global
| Ordovician | 485.4 | 470 | |
| Middle Ordovician | O2 | O2 |
chronostratigraphy
|
Series
|
global
| Ordovician | 470 | 458.4 | |
| Upper Ordovician | O3 | O3 |
chronostratigraphy
|
Series
|
global
| Ordovician | 458.4 | 443.8 |
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