The BGS Lexicon of Named Rock Units — Result Details

Allesley Member

Computer Code: ASY Preferred Map Code: Asy
Status Code: Full
Age range: Asturian Substage (CAS) — Stephanian Stage (CS)
Lithological Description: Redbed sequence; mudstone-dominated at base but becoming more arenaceous towards top. Impersistent conglomerates at some levels.
Definition of Lower Boundary: Taken at the junction between the highest sandstone package in the Keresley Member (Corley Sandstone) and the overlying mudstone unit.
Definition of Upper Boundary: Defined at the incoming of mudstones of the essentially argillaceous Tile Hill Mudstone Formation.
Thickness: c.140m
Geographical Limits: Warwickshire Coalfield (Sheet 169). Also likely to extend in the subcrop across the southern part of the Coalfield (Sheet 184).
Parent Unit: Salop Formation (SAL)
Previous Name(s): Coventry Sandstone Formation [Obsolete Name And Code: See ASY] (CYS)
Allesley Conglomerate (-3808)
Coventry Sandstone (-3809)
Alternative Name(s): none recorded or not applicable
Reference Section  Mount Nod Well No 2, Coventry SP27NE/46. Top of Allesley Member proved at 38.3m below surface. Base of Allesley Member proved at 170.5m below surface. 
Type Area  Warwickshire Coalfield; outcrops centred on the village of Allesley and extending from the Western Boundary Fault to the western suburbs of Coventry (poor exposure). 
Old, R A, Sumbler, M G and Ambrose, K, 1987. Geology of the country around Warwick. Memoir of the British Geological Survey, Sheet 184 (England and Wales). 
Bridge, D McC, Carney, J N, Lawley, R S and Rushton, A W A. 1998. Geology of the country around Coventry and Nuneaton. Memoir of the British Geological Survey, Sheet 169 (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, Bridge, D M and Rees, J G, 1990. Geology of the Coventry area. British Geological Survey Technical Report, WA/89/29 
Eastwood, T, Gibson, W, Cantrill, T C and Whitehead, T H. 1923. The geology of country around Coventry, including an account of the Carboniferous rocks of the Warwickshire Coalfield. Memoir of the Geological Survey of Great Britain, Sheet 169. (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used: