| Computer Code: |
LCM |
Preferred Map Code: |
LCM |
| Status Code: |
Index Level |
| Age range: |
Langsettian Substage (CA)
— Langsettian Substage (CA) |
| Lithological Description: |
[Obsolete: use PLCM, SWLCM, LCMS] Grey mudstone, siltstone and pale grey sandstone interbedded; coal seams common in upper part; mudstones with marine fossils (marine bands) present in lower part. |
| Definition of Lower Boundary: |
At base of mudstone of Subcrenatum Marine Band, or at base of lowest coal of the coal-bearing sequence if this marker band cannot be recognised. |
| Definition of Upper Boundary: |
At base of mudstone of Vanderbeckei Marine Band. |
| Thickness: |
Up to 650 m (Potteries Coalfield,North Staffordshire) ; more (720 m) 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 top boundary; Miry Wood, Apedale [SJ 8118 4940] - to be a designated RIGS - mudstone of Vanderbeckei Marine Band. |
| Reference Section |
For base and lower part. Ridgeway Borehole (SJ85SE/14) [SJ 8923 5381], down to 1806ft 10ins. SJ85SE/14. |
| Reference Section |
For top part; Hesketh Back Crut (Crosscut) [SJ 884 533], Chatterley Whitfield Colliery,Stoke on Trent, depth 2100ft to 1045ft in constructed stratigraphic section (V5 British Coal, G7 British Geological Survey). |
| Type Area |
Potteries Coalfield, Stoke on Trent, North Staffordshire; numerous borehole and shaft sections, not many exposures.[SJ 5090]. |
| Reference(s): |
| 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). |
| 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. |
| 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
E244
E245
E232
E231
E078
E139
E154
E086
E021
E010
E014
E081
E090
E091
E032
E026
E023
E015
E027
E114
E127
E070
E142
E022
E024
E028
E059
E167
E141
E019
E025
E281
E096
|
