The BGS Lexicon of Named Rock Units — Result Details
Cwm Clwyd Tuff Formation [Obsolete: use CGTU]
Computer Code: | CCT | Preferred Map Code: | CCT |
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Status Code: | Index Level | ||
Age range: | Soudleyan Substage (OY) — Soudleyan Substage (OY) | ||
Lithological Description: | [Obsolete: use CGTU] Details as for Cefn Gwyn Tuff Member. | ||
Definition of Lower Boundary: | Not defined. | ||
Definition of Upper Boundary: | Not defined. | ||
Thickness: | Not defined. | ||
Geographical Limits: | Term still in use in the Bala and Oswestry areas. | ||
Parent Unit: | none recorded or not applicable | ||
Previous Name(s): | Cwm Clwyd Ash [Obsolete Name And Code: See CCT]
(KZ)
Cwm Clwyd Tuff [Obsolete Name and Code: Use CCT] (-3910) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
none recorded or not applicable | |||
Reference(s): | |||
Brenchley, P J. 1978. The Caradocian rocks of the North and West Berwyn Hills. Geological Journal, Vol. 13, 137-164. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
E120 E136 E137 |