| Computer Code: |
HHDL |
Preferred Map Code: |
HHdL |
| Status Code: |
Full |
| Age range: |
Asbian Substage (CR)
— Asbian Substage (CR) |
| Lithological Description: |
Limestone: dark grey, even-bedded packstone at base, passing up into thickly bedded grainstone, paler grey. |
| Definition of Lower Boundary: |
Contact of dark grey even-bedded packstone with underlying palaeokarstic surface cut in pale grey grainstones of undivided Urswick Limestone Formation. |
| Definition of Upper Boundary: |
Palaeokarstic surface at top of paler grey grainstones; rapid change to dark limestone and mudstone of Gleaston Formation above. |
| Thickness: |
20m |
| Geographical Limits: |
South Cumbria. |
| Parent Unit: |
Urswick Limestone Formation (UL)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Humphrey Head, Grange-over-Sands. Section on foreshore. |
| Reference Section |
Kents Bank Station, Grange-over-Sands. Section on foreshore. |
| Reference Section |
Trowbarrow Quarry. Section in crags on east face of quarry: base marked 155m, top 163.60m. |
| Reference(s): |
| Johnson, E W, Soper, N J, Burgess, I C, Ball, D F, Beddoe-Stephens, B, Carruthers, R M, Fortey, N J, Hirons, S, Merritt, J W, Millward, D, Roberts, B, Walker, A B and Young, B. 2001. Geology of the country around Ulverston. Memoir of the British Geological Survey, England and Wales, Sheet 48. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
