The BGS Lexicon of Named Rock Units — Result Details

BROMSGROVE SANDSTONE FORMATION
Computer Code: BMS  Status Code: FORMAL ENTRY 
Preferred Map Code: BmS 
Age or Age Range: [ TL ] SCYTHIAN  to [ TA ] ANISIAN 
Lithological Description:
Sandstones, red, brown and grey, commonly pebbly or conglomeratic at the bases of beds, interbedded with red and brown siltstones and mudstones. 
Definition of Lower Boundary:
Disconformable on Wildmoor Formation or older formations; taken at base of lowest pebbly bed with chips of unweathered feldspar (Wills, 1976 p.37,99) at outcrop in type area. 
Definition of Upper Boundary:
Transitional at base of Mercia Mudstone Group. 
Thickness:
0->300m (Redditch area), 15-40m (Stoke-on-Trent area), c.500m (Worcester area). 
Geographical Limits:
Stafford and Worcester basins. 
Parent Unit: Parent Unit Code:
SHERWOOD SANDSTONE GROUP  SSG
Previous Name(s): Previous Code(s):
KEUPER SANDSTONE, LOWER  LKS 
Alternative Name(s):
none recorded or not applicable
Stratotypes:
Type Area  Bromsgrove, north Worcestershire (definition of Warrington, et al, 1980); basal Burcot Breccia exposures in Wills, 1976, p 37; other localities, Old, et al, 1991, p 18-30. 
Reference Section  Sugarbrook No 1 Borehole, Stoke Prior, near Bromsgrove, depth 33.5-281.8m (SO 96NE/1) (Wills, 1970; 1976, p 107). 
Reference Section  Metropolitan-Cammel Ltd, Saltley, Birmingham borehole 100/1944 (Wills, 1970). 25.9-217.2m in depth. (Wills,1976, p 134) (85ft-712ft 6in). 
Reference(s):
Howard, A S, Warrington, G, Ambrose, K, and Rees, J G. 2008. A formational framework for the Mercia Mudstone Group (Triassic) of England and Wales. British Geological Survey Research Report, RR/08/04. 
Wills, L J, 1976. The Trias of Worcestershire and Warwickshire. Report of the Institute of Geological Sciences, No.76/2, p.211. 
Wills, L J, 1970. The Triassic succession in the central Midlands in its regional setting. Quarterly Journal of the Geological Society of London, Vol.126, 225-285. 
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). 
Warrington, G, Audley-Charles, M G, Elliott, R E, Evans, W B, Ivimey-Cook, H C, Kent, P E, Robinson, P L, Shotton, F W, and Taylor, F M. 1980. A correlation of the Triassic rocks in the British Isles. Special Report of the Geological Society of London, No.13. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
Map Code Sheet Name
E  216
E  155
E  123
E  140
E  184
E  183
E  199
E  139
E  154
E  167
E  217
E  201
E  141
E  236

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