Uhaku Stage
| Belongs to | Purtse Subseries |
| Type | chronostratigraphy |
| Rank | Stage |
| Scope | regional |
| Status | formal standard |
| Author | Öpik |
| Year | 1937 |
| Etymon | Uhaku, river (E) |
| Age top (Ma) | 460.9 |
| Age base (Ma) | 462.6 |
| Age (Ma) | Darriwilian |
| Age reference | Cooper & Sadler, 2004 |
| Index | CIc |
| Alt. index | O2UH |
| Date changed | 2022-12-05 |
Locality | Type | From (m) | To (m) | Reference | Remarks | |
|---|---|---|---|---|---|---|
| Uhaku säng | holostratotype | Rõõmusoks, 1967a |
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