| Computer Code: |
COYB |
Preferred Map Code: |
COL |
| Status Code: |
Pending Upgrade |
| Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
| Lithological Description: |
Flaggy, laminated feldspathic psammite and micaceous psammite with minor bands of schistose semipelite; quartzite locally important. |
| Definition of Lower Boundary: |
Conformable and transitional with Kincraig Formation but poorly exposed. Marked by change to dominantly psammite. |
| Definition of Upper Boundary: |
Conformable transition up into more siliceous and feldspathic psammites of the Glen Spean Subgroup south of the Cairngorm Mountains. |
| Thickness: |
500m to 1km. |
| Geographical Limits: |
Northern Cairngorm Mountains and Mid-Speyside, Central Highlands of Scotland, sheets 74E and 64E. |
| Parent Unit: |
Corrieyairack Subgroup (GRCO)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Creag nan Gall to Stac na H-iolaire upper slopes. |
| Partial Type Section |
Section in River Druie immediately south of Coylumbridge Village. |
| Reference(s): |
| Highton, A J, 1999. Solid geology of the Aviemore district, Memoir for 1:50000 geological sheet 74E [Scotland]. London: The Stationery Office. 97pp. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S074
|
