| Computer Code: |
GRCO |
Preferred Map Code: |
CO |
| Status Code: |
Full |
| Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
| Lithological Description: |
Feldspathic psammites, semipelites and micaceous psammites, subordinate quartzites, calc-silicate rocks. |
| Definition of Lower Boundary: |
Not exposed. |
| Definition of Upper Boundary: |
Overlain conformably by quartzose psammites, semipelites and quartzites of the Appin Group. |
| Thickness: |
up to 10km. |
| Geographical Limits: |
Central Highlands of Scotland, notably in the southwest part of the Monadhliath Mountains. |
| Parent Unit: |
Grampian Group (GRAM)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Loch Laggan area. |
| Reference(s): |
| Winchester, J A and Glover, BW, 1988. The Grampian Group, in Winchester, J A [ed.]. Late Proterozoic stratigraphy of the northern Atlantic regions. Blackie, Glasgow, 146-161. |
| Glover, B W, and Winchester, J A. 1989. The Grampian Group, a major Late Proterozoic clastic sequence in the Central Highlands of Scotland. Journal of the Geological Society, London. Vol. 146, 85-96. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S062
S064
S074
S074
S063
S063
S073
S073
S054
|
