The BGS Lexicon of Named Rock Units — Result Details

Enville Member

Computer Code: EN Preferred Map Code: En
Status Code: Full
Age range: Asturian Substage (CAS) — Cisuralian Epoch (PLC)
Lithological Description: Red mudstone and red-brown, fine- to coarse-grained sandstone, locally pebbly, and lenticular beds of conglomerate. Sandstone mostly sublitharenite; conglomerate clasts mostly Carboniferous limestone and chert.
Definition of Lower Boundary: Poorly defined; taken arbitrarily at base of sandstone dominated succession that overlies the Alveley Member and is characterised by conglomerates and pebbly sandstones with extra-basinal clasts, commonly of Carboniferous limestone and chert.
Definition of Upper Boundary: Unconformable/disconformable; sharp junctions with overlying Clent Formation (breccia) in the Clent Hills; gradational boundary with mudstone dominated Clent Formation; or taken at the base of red mudstone/sandstone with Uriconian volcanic clasts in Gospel End area (West Midlands)
Thickness: 100-275m in West Midlands.
Geographical Limits: Salop and West Midlands.
Parent Unit: Salop Formation (SAL)
Previous Name(s): Enville Formation [Obsolete Name And Code: See EN] (EB)
Enville Beds (-2164)
Bowhills Formation [Obsolete Name And Code: See EN] (BWH)
Calcareous Conglomerate Group [Obsolete Name And Code: See EN] (CACG)
Hamstead Formation [Obsolete Name And Code: Use EN] (HSB)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Romsley Borehole (SO97NE/216): upper boundary at 8.85m, to 67.35m depth (upper part of Member). Glover and Powell, 1996 
Reference Section  BGS Daleswood Farm Borehole (SO97NE/452) from 97.7m (base) to 3.7m depth (close to top of Member). Glover and Powell, 1996 
Type Area  Bowhills and Enville Sheepwalks, between Alveley and Enville villages, (Salop and West Midlands respectively) 
Reference(s):
Ramsbottom, W H C, Calver, M A, Eagar, R M C, Hodson, F, Holliday, D W, Stubblefield, C J and Wilson, R B. 1978. A correlation of the Silesian rocks in the British Isles. Geological Society of London, Special Report No.10. 
Whitehead, T H and Pocock, R W. 1947. Geology of the country around Dudley and Bridgnorth. Memoir of the British Geological Survey, Sheet 167. (England and Wales). 
Powell, J H, Chisholm, JI, Bridge, D M, Rees, J G, Glover, B W and Besly, B M. 1999. Stratigraphical framework for Westphalian to Early Permian red-bed successions of the Pennine Basin. British Geological Survey Technical Report WA/99/10. 
Old R A, Hamblin, R J O, Ambrose, K, and Warrington G. 1991. Geology of the country around Redditch. Memoir of the British Geological Survey, Sheet 183 (England and Wales). 
Glover, B M and Powell, J H, 1996. Interaction of climate and tectonics upon alluvial architecture: Late Carboniferous-Early Permian sequences at the southern margin of the Pennine Basin, UK. Palaeogeography, Palaeoclimatology and Palaeoecology, Vol. 121, 13 - 34. 
Whitehead, T H and Eastwood, T, 1927. The geology of the southern part of the South Staffordshire Coalfield. Memoir of the Geological Survey of Great Britain. 
Eastwood, T, Whitehead, T H and Robertson, T, 1925. The geology of the country around Birmingham. Memoir of the British Geological Survey of Great Britain. 
Powell, J H, Glover, B W and Waters, C N, 1992. A Geological background for planning and development in the `Black Country'. British Geological Survey Technical Report WA/92/33. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E168 E167 E153 E183 E154 E201