The BGS Lexicon of Named Rock Units — Result Details

Coire Cheap Formation

Computer Code: COCH Preferred Map Code: CC
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Semipelite and pelite, schistose to gneissose and locally kyanite-rich, containing calc-silicate rock and metalimestone units. Cut by abundant amphibolite sheets.
Definition of Lower Boundary: Sharp base at the marked quartzite-pelite / semipelite boundary at the top of the Kinlochlaggan Quartzite Formation. Alternatively lies above the Kinlochlaggan 'Boulder Bed'.
Definition of Upper Boundary: Not seen ie. this is the youngest unit exposed in the major Kinlochlaggan syncline.
Thickness: Not known, but at least 200m
Geographical Limits: Ardverikie Forest between Aonach Beag [NN 455 740] and the River Spey at [NN 933 571], sheet 63E [Dalwhinnie].
Parent Unit: Ballachulish Subgroup (DABH)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Area  Coire Cheap on the northeast flank of Geal Charn. 
Reference Section  Burn section in lower part of Allt Coire Cheap. 
Reference Section  Burn section in lower part of Allt Liath nam Badan. 
Robertson, S and Mendum, J R, in press. Lithostratigraphy of the Grampian and Appin Groups in the Dalwhinnie district, sheet 63E, Scotland. British Geological Survey Technical Report. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S054 S063