| Computer Code: |
UCW |
Preferred Map Code: |
UCw |
| Status Code: |
Index Level |
| Age range: |
Gorstian Age (SG)
— Gorstian Age (SG) |
| Lithological Description: |
[Obsolete: use WRE] Blue-grey, finely laminated muddy siltstones with laminae of coarser siltstone. Silt laminae are more common than in the Brathay Flags and the overall grain size is slightly coarser. |
| Definition of Lower Boundary: |
Transitional, taken at junction of the laminated siltstones with more massive, cleaved, calcareous siltstones of the Middle Coldwell Beds. |
| Definition of Upper Boundary: |
Taken at the incoming of thin sandstones, producing a transition to the Coniston Grit Formation. |
| Thickness: |
c. 460 metres maximum, thins eastwards. |
| Geographical Limits: |
Not defined. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Coldwell, near Hawkshead, Cumbria (south from NY 359 010), good section seen in Kill Gill, Kentmere, Sheet 38 (Ambleside). |
| Reference(s): |
| Marr J E. 1892. On the Wenlock and Ludlow strata of the Lake District. Geological Magazine, Vol. 9, p 534-541. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E039
|
