| Computer Code: |
UCM |
Preferred Map Code: |
PUCM |
| Status Code: |
Index Level |
| Age range: |
Bolsovian Substage (CC)
— Asturian Substage (CAS) |
| Lithological Description: |
[Obsolete: use PUCM, SWUCM, UCMS] 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: |
none recorded or not applicable
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| 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. |
| 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(s): |
| 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). |
| 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. |
| 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
|
