St. Maughan's Formation
| St. Maughan's Formation | |
|---|---|
| Stratigraphic range: Devonian | |
| Mynydd Troed, the base of the hill consisting of St. Maughan's Formation | |
| Type | Formation | 
| Unit of | Old Red Sandstone | 
| Lithology | |
| Primary | Mudstone | 
| Other | Sandstone, Conglomerate | 
| Location | |
| Region | Wales | 
| Country | United Kingdom | 
The St. Maughan's Formation is a geologic formation in Wales. It preserves fossils dating back to the Devonian period.