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
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