| Computer Code: |
HWL |
Preferred Map Code: |
HwL |
| Status Code: |
Full |
| Age range: |
Brigantian Substage (CX)
— Brigantian Substage (CX) |
| Lithological Description: |
Limestone with subsidiary mudstone. |
| Definition of Lower Boundary: |
Where limestone overlies sandstone of the Thorney Force Sandstone. |
| Definition of Upper Boundary: |
Where limestone is overlain by mudstone of the Gayle Shale. |
| Thickness: |
c. 21 m. |
| Geographical Limits: |
none recorded or not applicable
|
| Parent Unit: |
Alston Formation (AG)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
Smiddy Limestone
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Dean, M T, Browne, M A E, Waters, C N and Powell, J H. 2011. A lithostratigraphical framework for the Carboniferous successions of northern Great Britain (onshore). British Geological Survey Research Report, RR/10/007. 165pp. |
| Dunham, K C, and Wilson, A A. 1985. Geology of the Northern Pennine Orefield. Volume 2 Stainmore to Craven. Economic Memoir of the British Geological Survey, Sheets 40, 41 and 50, and parts of Sheets 31, 32, 51, 60 and 61(England and Wales). |
| Moore D, 1958. The Yoredale Series of Upper Wensleydale and adjacent parts of North-West Yorkshire. Proceedings of the Yorkshire Geological Society, Vol.31, 91-148. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E050
E040
E041
E051
|
