| Caerfai Group | |
|---|---|
| Stratigraphic range: Comley Epoch Cambrian | |
| Type | Group |
| Sub-units | Ogof Golchfa, St Non’s, Caerfai Bay and Caer Bwdy Bay Formations |
| Underlies | Porth-y-rhaw Group - Drumian Stage |
| Overlies | Ogofgolchfa Group of Pebidian Supergroup |
| Thickness | at least 564m. |
| Lithology | |
| Primary | sandstones |
| Other | mudstone, conglomerate |
| Location | |
| Region | west Wales |
| Country | Wales |
| Type section | |
| Named for | Caerfai Bay |
The Caerfai Group is a Cambrian lithostratigraphic group (a sequence of rock strata) in west Wales. The name is derived from Caerfai Bay on the north coast of St Brides Bay on the Pembrokeshire coast where the strata are well exposed in coastal cliffs. This rock succession has previously been known variously as the Caerfai Series, Caerfai Formation and Caerfai Beds and largely ascribed to the British regional stratigraphic unit Comley Epoch, though these terms are now obsolete.[1]