The BGS Lexicon of Named Rock Units — Result Details
Cwm-Amliw Tuff Formation [Obsolete]
| Computer Code: | CMA | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Index Level | ||
| Age range: | Caradoc Series (O4) — Caradoc Series (O4) | ||
| Lithological Description: | none recorded or not applicable | ||
| Definition of Lower Boundary: | none recorded or not applicable | ||
| Definition of Upper Boundary: | none recorded or not applicable | ||
| Thickness: | c.35m | ||
| Geographical Limits: | Cwm-Amliw, near Builth Wells, Powys. | ||
| Parent Unit: | none recorded or not applicable | ||
| Previous Name(s): | Cwm-Amliw Group [Obsolete Name and Code: Use CMA]
(-139)
Cwm-Amliw Series [Obsolete Name and Code: Use CMA] (-2101) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | The area around Cwm-Amliw, near Builth Wells, Powys. | ||
| Reference(s): | |||
| Jones, O T and Pugh, W J. 1941. The Ordovician rocks of the Builth District. A preliminary account. Geological Magazine, Vol.78, p.190. | |||
| Schofield, D I, Davies, J R, Waters, R A, Williams, M and Wilson, D. 2004. The Builth Wells District - a brief explanation of the geology. Sheet explanation of the British Geological Survey 1:50 000 Sheet 196 Builth Wells (England and Wales). (Keyworth, Nottingham: British Geological Survey). | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E179 E196 | |||