The BGS Lexicon of Named Rock Units — Result Details

Cock Burn Calcareous Schist Formation

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
Type Section  Cock Burn from 300m south of Corgarff Castle, southwards to its headwater burns. 
Memoir of the British Geological Survey, Sheet 75, in preparation. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: