The BGS Lexicon of Named Rock Units — Result Details

Upper Coal Measures Formation [Obsolete Name And Code: Use PUCM, UCMS]

Computer Code: UCM Preferred Map Code: PUCM
Status Code: Index Level
Age range: Bolsovian Substage (CC) — Asturian Substage (CAS)
Lithological Description: Grey mudstone, siltstone and pale grey sandstone interbedded; coal seams common; no mudstones with marine fossils (marine bands) present.
Definition of Lower Boundary: At top of mudstone of Cambriense Marine Band. (Base defined by Stubblefield and Trotter, 1957).
Definition of Upper Boundary: At point in conformable sequence where red or brown mudstones of primary origin (eg Etruria Formation) become predominant over grey beds; or at base of sub-Permian unconformity.
Thickness: Up to c.400m in the Potteries Coalfield; to c.350m in Lancashire.
Geographical Limits: Northern and Central England and Wales.
Parent Unit: Coal Measures Group (CM)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Potteries Coalfield Stoke on Trent, North Staffordshire; numerous borehole and shaft sections, not many exposures [SJ 8396 5029]. 
Reference Section  For top and upper part. Wolstanton Colliery No.3 shaft Stoke on Trent from 1142ft 7ins to base of shaft. SJ84NE/29 [SJ 8606 4800]. 
Reference Section  For base. Parkhouse Colliery No. 1 underground bore Stoke on Trent (SJ85SW/19) [SJ 8396 5029] at 529ft depth - top of Cambriense Marine Band. 
Reference Section  For base and lower part. Holditch Colliery No.4 underground borehole, Stoke on Trent (SJ84NW/30) [SJ 8392 4850] 657ft to 0ft. Top of Cambriense Marine Band to above Great Row Coal. 
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. 
Stubblefield, C J and Trotter, F M, 1957. Divisions of the Coal Measures on Geological Survey Maps of England and Wales. Bulletin of the Geological Survey of Great Britain, No.13, p.1-5. 
Rees, J G and Wilson, A A. 1998. Geology of the country around Stoke-on-Trent. Memoir of the British Geological Survey, Sheet 123 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E123 E216 E126 E262 E232 E078 E021 E014 E020 E081 E090 E091 E011 E023 E015 E217 E142 E022 E028 E236 E250 E141 E012 E279 E281 E009 E050 E085 E087 E098 E100 E155