| Computer Code: |
COQU |
Preferred Map Code: |
SYMB |
| Status Code: |
Full |
| Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
| Lithological Description: |
Orthoquartzite, fawn to white; cross-bedded with pinkish haematite streaks. Thin micaceous interbeds common. Gritty in parts. Flaggy, micaceous psammites locally at top and base. |
| Definition of Lower Boundary: |
At lower limit of persistent pasmmite or quartzite above the Mortlach Graphitic Schist Formation. |
| Definition of Upper Boundary: |
At upper limit of persistent psammite or quartzite below phyllites and calcareous schists of the Ailnack Phyllite and Limestone Formation or the Cock Burn Calcareous Schist Formation. |
| Thickness: |
Generally 80-300m. Wider outcrops may be due to folding. |
| Geographical Limits: |
Loch Builg, Inchrory and Carn Mor, upper Strath Don northwards via Glen Avon, Glen Livet. Glen Fiddich to the Balloch Hills near Keith. Small outcrops farther north around Windyhills. 1:50 000 Sheets 75W, 75E, 85E, 86W, 96 (just). |
| Parent Unit: |
Ballachulish Subgroup (DABH)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
River Livet, Tomnavoulin. |
| Type Area |
Ridge extending northeast from Cairn Muldonich, Glenlivet, via Corryhabbie Hill to Lairds Seat, Glenfiddich. |
| Reference Section |
Water of Ailnack, Tomintoul. |
| 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
S075
S086
S096
|
