| Computer Code: |
UL |
Preferred Map Code: |
UL |
| Status Code: |
Full |
| Age range: |
Asbian Substage (CR)
— Asbian Substage (CR) |
| Lithological Description: |
Mainly thickly and well-bedded pale grey grainstones or calcarenites, commonly with darker mottling (pseudobreccia) and a rubbly texture, especially adjacent to scattered partings and thin beds of grey and varicoloured clay. |
| Definition of Lower Boundary: |
Point where poorly bedded limestones of the Park Limestone Formation pass upwards into well bedded limestones and "pseudobreccias". |
| Definition of Upper Boundary: |
Taken where the predominantly pale thickly bedded Urswick Limestones pass up into the predominantly dark thinner-bedded limestones of the Alston Formation (formerly Gleaston Formation). |
| Thickness: |
115-180m |
| Geographical Limits: |
South Cumbria - north Lancashire from Duddon Estuary to Carnforth area. |
| Parent Unit: |
Great Scar Limestone Group (GSCL)
|
| Previous Name(s): |
Urswick Limestone [Obsolete Name and Code: Use UL]
(-2517)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Stainton quarries (Crown: SD 245 728) to (Devonshire: SD 249 728). Quarry complex north of the village of Stainton, exposing some 77m of the formation including basal contact with the Park Limestone Formation. |
| Reference Section |
Natural crags in steeply dipping beds 200m east-north-east of Kirk House, Over Kellett, Carnforth, Lancs. |
| Reference Section |
Trowbarrow Quarry (disused) exposes 150m, almost the full thickness of the formation. |
| Reference(s): |
| Rose, W C C. 1977. Geology and Hematite deposits of South Cumbria. Economic Memoir for 1:50,000 Sheet 58 and southern part of Sheet 48. Memoir of the geological Survey of Great Britain. |
| Dunham, K C, and Rose, W C C. 1941. Geology of the iron-ore field of south Cumberland and Furness. Geological Survey of Great Britain, Wartime Pamphlet, No. 16. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E059
E058
E048
|
