The BGS Lexicon of Named Rock Units — Result Details

Warwickshire Group

Computer Code: WAWK Preferred Map Code: Wk
Status Code: Full
Age range: Duckmantian Substage (CB) — Cisuralian Epoch (PLC)
Lithological Description: Predominantly red, brown or purple-grey sandstone, siltstone and mudstone, some grey strata, coals not common, local conglomerates, localised beds of Spirorbis limestone.
Definition of Lower Boundary: At gradational conformable base of the lowest red-bed formation, which is generally the red mudstones of the Etruria Formation above the Coal Measures, at the sharp unconformable base of red-beds of late Carboniferous age if the Coal Measures are absent, or locally at the base of grey beds, seen as grey-green sandstone of the Halesowen Formation.
Definition of Upper Boundary: At the base of the unconformable (post-Variscan) Permian or younger strata.
Thickness: About 1225 m thick in Warwickshire, up to 1192 m thick in the Stoke-on-Trent area.
Geographical Limits: The Pennine Basin in Staffordshire, Warwickshire, Shropshire, Lancashire, Nottinghamshire and South Yorkshire.
Parent Unit: Not Applicable (-)
Previous Name(s): Red Measures (-599)
Barren Measures Group [Obsolete Name And Code: See WAWK] (BME)
Barren Measures (-4960)
Ardwick Group [Obsolete Name And Code: See WAWK] (ARG)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  The Warwickshire Coalfield from Tamworth [SK 2203] to Warwick [SP 2865]. 
Reference(s):
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. 
Waters, C N, Waters, R A, Barclay, W J, and Davies, J R. 2009. Lithostratigraphical framework for Carboniferous successions of Southern Great Britain (Onshore). British Geological Survey Research Report, RR/09/01. 184pp. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E084 E085 E097 E098 E108 E109 E121 E122 E123 E137 E138 E139 E152 E153 E154 E155 E166 E167 E168 E169 E183