| Computer Code: |
CF |
Preferred Map Code: |
notEntered |
| Status Code: |
Index Level |
| Age range: |
Bolsovian Substage (CC)
— Bolsovian Substage (CC) |
| Lithological Description: |
Massive, quartzose sandstone with subordinate and impersistent beds of mudstone and coal. |
| Definition of Lower Boundary: |
A sharp contact with underlying measures of the Pennine Middle Coal Measures Formation, which overlies an unnamed coal in its type area. |
| Definition of Upper Boundary: |
Contact with overlying measures of Pennine Middle Coal Measures Formation. |
| Thickness: |
Up to 37 m thick. |
| Geographical Limits: |
Denbighshire Coalfield (SJ 30 50). |
| Parent Unit: |
Pennine Middle Coal Measures Formation (PMCM)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Sandstone ridge between Garden Lodge, in the north, and Cefn-mawr, in the south, located between the Cefn & Minera faults. Wedd C B. 1928. |
| Reference(s): |
| Wedd, C B, Smith, B and Wills, L J. 1927. The geology of the country around Wrexham, Part 1. Lower Palaeozoic and Lower Carboniferous rocks. Memoir of the Geological Survey of Great Britain. [London: HMSO.] 179pp. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E121
|
