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. 140 m.
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 [Obsolete Name and Code: Use AYC, ASY] (-3808)
Coventry Sandstone [Obsolete Name and Code: Use CYS, ASY] (-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). 
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. 2000. 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). 
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). 
1:50K maps on which the lithostratigraphical unit is found, and map code used: