Computer Code: |
CBCS |
Preferred Map Code: |
SYMB |
Status Code: |
Full |
Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
Lithological Description: |
Calcareous semipelites and micaceous psammites, grey-green, phyllitic to schistose. Abundant laminated and striped calc-silicate and limestone bands. |
Definition of Lower Boundary: |
At upper limit of quartzite of Corryhabbie Quartzite Formation. |
Definition of Upper Boundary: |
At passage from calcareous semipelite and psammite into graphitic pelite of the Allarghe Graphitic Schist Member. |
Thickness: |
c. 300m. |
Geographical Limits: |
Confined to inverted 'tea-cup' shaped outcrop south of Allargue and Corgarff on Upper Donside, cut by Cock Burn and River Don. To south, cut out by Glen Gairn Granite. |
Parent Unit: |
Ballachulish Subgroup (DABH)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Section |
Cock Burn from 300m south of Corgarff Castle, southwards to its headwater burns. |
Reference(s): |
Memoir of the British Geological Survey, Sheet 75, in preparation. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
S075
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