Computer Code: |
MCM |
Preferred Map Code: |
MCM |
Status Code: |
Index Level |
Age range: |
Duckmantian Substage (CB)
— Bolsovian Substage (CC) |
Lithological Description: |
[Obsolete: use PMCM, MCMS, SWMCM] Grey mudstone, siltstone and pale grey sandstone interbedded; coal seams common mudstone with marine fossils; (marine bands) present in the upper half and a single one at base. |
Definition of Lower Boundary: |
At base of mudstone of Vanderbeckei Marine Band. |
Definition of Upper Boundary: |
At top of mudstone of Cambriense Marine Band. |
Thickness: |
Up to c.680m in Potteries Coalfield, North Staffordshire; more (to c.750m) in Lancashire. |
Geographical Limits: |
Central and northern England and North 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. Hesketh Back Crut, Chatterley Whitfield Colliery (Crosscut) [SJ 884 553]. Depth 1045ft to top of section in constructed stratigraphic section (V5 British Coal, G7 British Geological Survey log). |
Reference Section |
For base. Miry Wood, Apedale [SJ 8118 4940] - to be a designated RIGS - Vanderbeckei Marine Band. |
Type Area |
Potteries Coalfield, Stoke on Trent; numerous borehole and shaft sections, not many exposures [SJ 5090]. |
Reference Section |
For upper part. Holditch Colliery. No.4 underground borehole (SJ84NW/30) [SJ 8392 4850], 657ft to 1068ft. Below Rowhurst Coal to top of Cambriense Marine Band. |
Reference Section |
For top. Parkhouse Colliery No.1 underground bore Stoke on Trent at 529ft depth - top of Cambriense Marine Band. SJ85SW/19 [SJ 8396 5029]. |
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
E126
E077
E262
E249
E248
E247
E232
E231
E078
E154
E021
E010
E014
E020
E081
E090
E091
E032
E026
E023
E015
E027
E114
E127
E070
E217
E142
E022
E028
E167
E141
E019
E025
E281
E264
E096
E009
E018
E031
E050
E084
E085
E087
E097
E098
E100
E108
E110
E112
E124
E125
E152
E153
E155
E168
E169
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