Computer Code: |
COL |
Preferred Map Code: |
CoL |
Status Code: |
Index Level |
Age range: |
Cautleyan Stage (OU)
— Hirnantian Age (OH) |
Lithological Description: |
[Obsolete: use DNT]
Interbedded, cleaved calcareous mudstones and nodular, argillaceous limestones with subordinate conglomerates, sandstones, siltstones, shales and acid volcanic rocks. |
Definition of Lower Boundary: |
At base of Longsleddale Formation, unconformable upon volcanic strata of Borrowdale Volcanic Group. |
Definition of Upper Boundary: |
At base of Black Shales of the Skelgill Beds. |
Thickness: |
c. 40 metres, maximum thickness of 110 metres at Kentmere. |
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 |
Coniston District, Cumbria, e g. north west of Ashgill Quarry, Sheet 38, Ambleside. |
Reference(s): |
McNamara, K J. 1979. The age, stratigraphy and genesis of the Coniston Limestone Group in the southern Lake District. Geological Journal, 14, 41-69. |
Mitchell, G H. 1956. The geological history of the Lake District. Proceedings of the Yorkshire Geological Society. Vol.30, p.432. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E038
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