| 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.
The Llanfallteg Formation is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period. It predominantly consists of ash containing siltstones, as wells as ash fall deposits and tuffs. It likely dates to the Darriwilian based on graptolites. The local graptolite fauna includes Didymograptus artus and Glossograptus armatus. The local trilobite fauna includes agnostids, phacopids and asaphids.
The Trefawr Formation is a geologic formation in Wales. It preserves fossils dating back to the Silurian period.
The Milford Haven Formation is a geologic formation in Wales. It preserves fossils dating back to the Silurian period.
The Bronydd Formation is a geologic formation in Wales. It preserves fossils dating back to the Silurian period.
The Treiorwerth Formation is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Wenallt Formation is a geologic formation near Garth in Powys, Wales. It preserves fossils dating back to the Ordovician period.
The Nant Ffrancon Fermation is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Nant Hir Formation is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Llanfawr Mudstones is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Glyn Gower Formation is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Dolhir Formation is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Gelli Formation is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Cwm Felin Boeth Formation is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Afon Ffinnant Formation is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Rhiwlas Formation is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Llyn y Gafr Formation is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Bod Deiniol Formation is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Senni Beds is the former name of the Senni Formation in Wales. It preserves fossils dating back to the Devonian period.
The Llanelly Formation is a geologic formation in Wales. It preserves fossils dating back to the Carboniferous period.
The Llwyn Formation is a geologic formation in Wales. It preserves fossils dating back to the Carboniferous period.
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