The BGS Lexicon of Named Rock Units — Result Details
Cwm-Amliw Tuff Formation [Obsolete]
Computer Code: | CMA | Preferred Map Code: | notEntered |
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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) |
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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 |