Stratigraphy
Tremadocian
| 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 |
Locality | Type | From (m) | To (m) | Reference | Remarks | |
|---|---|---|---|---|---|---|
| Green Point Section, western Newfoundland | boundary stratotype | 101.8 | Cooper et al., 2001 |
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