Lower Ordovician
General info
| Belongs to |
Ordovician
|
| Type | chronostratigraphy |
| Rank | Series |
| Scope | global |
| Status | formal standard |
| Age top (Ma) | 470 |
| Age base (Ma) | 485.4 |
| Index | O1 |
| Alt. index | O1 |
| Date added | 2003-03-23 |
| 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 |
| Reference | Content | Year1 | Pages | Remarks |
|---|---|---|---|---|
| Gradstein et al., 2004 |
2004
| |||
| Gradstein et al., 2012 |
2012
| |||
| Cooper et al., 2001 | GSSP proposal |
2001
| ||
| Goldman et al., 2020 |
2020
| 630-694 |
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