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:
Type Area  Bowhills and Enville Sheepwalks, between Alveley and Enville villages, (Salop and West Midlands respectively) 
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 
Reference Section  Romsley Borehole (SO97NE/216): upper boundary at 8.85m, to 67.35m depth (upper part of Member). Glover and Powell, 1996 
Reference(s):
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. 
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. 
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 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. 
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). 
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). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E168 E167 E153 E183 E154 E201