| Computer Code: |
GAS |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Langsettian Substage (CA)
— Langsettian Substage (CA) |
| Lithological Description: |
Sandstone, buff-grey, fine-to medium-grained, micaceous, thickly-to thinly-bedded, cross-bedded and ripple-laminated. |
| Definition of Lower Boundary: |
The lower boundary is taken at the base of the first sandstone of a sandstone-dominated unit above the Lower Mountain Coal. |
| Definition of Upper Boundary: |
The upper boundary is taken at the base of a mudstone-dominated succession overlying the sandstone of the Great Arc Sandstone; often coincident with the base of the seatearth underlying the Upper Foot Coal. |
| Thickness: |
20 m maximum thickness. |
| Geographical Limits: |
Wigan (SD 5805), Manchester (SJ 8398) and Rochdale (SD 8913) areas. |
| Parent Unit: |
Pennine Lower Coal Measures Formation (PLCM)
|
| Previous Name(s): |
Bullion Mine Rock [Obsolete Name And Code: Use GAS]
(BR)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Stream section east of Clough Bottom Reservoir, in Warmden Clough (no further details available). Wright et al. 1927. |
| Reference Section |
Laund Clough, waterfall section, which exposes the base of the unit. (no further details available). Wright et al. 1927. |
| Reference(s): |
| Wright, W B, Sherlock, R L, Wray, D A, Lloyd, W and Tonks, L H, 1927. The Geology of the Rossendale Anticline. Memoir of the Geological Survey, England. England and Wales Sheet 76. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E084
E085
E076
|
