Porkuni Stage
| Belongs to | Atla Subseries |
| Type | chronostratigraphy |
| Rank | Stage |
| Original rank | Schicht |
| Scope | regional |
| Status | formal standard |
| Author | Schmidt |
| Year | 1881 |
| Etymon | Porkuni, place in central Estonia; historical name: Borkholm |
| Original locality | Porkuni, Borkholm |
| Age top (Ma) | 443.7 |
| Age base (Ma) | 445.6 |
| Age (Ma) | Hirnantian |
| Age reference | Cooper & Sadler, 2004 |
| Index | FII |
| Alt. index | O3POR |
| Date changed | 2021-10-04 |
Locality | Type | From (m) | To (m) | Reference | Remarks | |
|---|---|---|---|---|---|---|
| Porkuni quarry | holostratotype | Rõõmusoks, 1967a | ||||
| Kamariku borehole | neostratotype | 18.17 | 24.45 | Oraspõld, 1975b |
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