The BGS Lexicon of Named Rock Units — Result Details

Hughes Member [Obsolete Code: Use H]

Computer Code: HUGH Preferred Map Code: H
Status Code: Index Level
Age range: Asturian Substage (CAS) — Asturian Substage (CAS)
Lithological Description: Green-grey Pennant sandstones, seen as lithic arenites, with thin mudstone, siltstone and seatearth interbeds, and mainly thin coals.
Definition of Lower Boundary: At the base of the Hughes (Cefn Glas, Wenallt, Bettws Four-Feet, Ty-du etc) Coal.
Definition of Upper Boundary: The base of the Golden (Swansea Three-Feet, Graigola) Seam.
Thickness: From 45 m to 240 m thick.
Geographical Limits: South Wales Coalfield.
Parent Unit: Pennant Sandstone Formation (PES)
Previous Name(s): Hughes Formation (-2226)
Hughes Beds (-946)
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
Woodland, A W, Evans, W B and Stephens, J V. 1957. Classification of the Coal Measures of South Wales with Special reference to the Upper Coal Measures. Bulletin of the Geological Survey of Great Britain, No. 13, 39-60. 
Waters, C N, Brown, M A E, Dean, M T and Powell, J H. In press. Lithostratigraphical framework for Carboniferous successions of Great Britain (Onshore). British Geological Survey Research Report, RR/05/06. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E232