Tremadocian
General info
| Belongs to |
Lower Ordovician
|
| Type | chronostratigraphy |
| Rank | Stage |
| Scope | global |
| Status | formal standard |
| Author | Sedgwick |
| Year | 1847 |
| Etymon | Tremadoc, village in Wales |
| Age top (Ma) | 477.7 |
| Age base (Ma) | 485.4 |
| Date added | 2003-04-02 |
| 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 |
| Stratigraphy | Index | Index add'l | Type | Rank | Scope | Belongs to | Age base (Ma) | Age top (Ma) | Age |
|---|---|---|---|---|---|---|---|---|---|
| Pakerort Stage | AII | O1PK |
chronostratigraphy
|
Stage
|
regional
| Iru Subseries | 489.8 | 486.2 |
Tremadocian
|
| Varangu Stage | AIII | O1VR |
chronostratigraphy
|
Stage
|
regional
| Iru Subseries | 486.2 | 483.4 |
Tremadocian
|
| Karepa Substage | AIIb |
chronostratigraphy
|
Substage
|
regional
| Pakerort Stage | 488.3 | 486.2 |
Tremadocian
|
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