Global InformationDrefach Group information
| Drefach Group | |
|---|---|
| Stratigraphic range: early Ordovician | |
| Type | Group |
| Sub-units | Mydrim Shales Formation, Mydrim Limestone Formation, Hendre Shales Formation, Asaphus Ash Formation, Felin-wen Formation |
| Underlies | Nantmel Mudstones Formation |
| Overlies | various formations |
| Lithology | |
| Primary | mudstones |
| Other | turbidites, limestone, tuff |
| Location | |
| Region | west Wales |
| Country | Wales |
| Type section | |
| Named for | Drefach (village) |
The Drefach Group is an Ordovician lithostratigraphic group (a sequence of rock strata) in west Wales. The name is derived from the village of Drefach near Meidrim (a.k.a. Mydrim) in Carmarthenshire. The Group comprises the Mydrim Shales Formation, the Mydrim Limestone Formation, the Hendre Shales Formation, Asaphus Ash Formation and at its base, the underlying Felin-wen Formation.[1]
- ^ http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=DRE (BGS on-line lexicon of rock units)