| Computer Code: |
GRGL |
Preferred Map Code: |
G |
| Status Code: |
Full |
| Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
| Lithological Description: |
Feldspathic, siliceous and micaceous psammite with subordinate quartzite and semipelite, distinctive pebbly bands in upper part. |
| Definition of Lower Boundary: |
Not seen. |
| Definition of Upper Boundary: |
Sharp, attenuated contact with overlying semipelite unit of the Corrieyairack Subgroup. |
| Thickness: |
2.5 km to 3 km. |
| Geographical Limits: |
Central Highlands of Scotland. Glen Shirra, Strathnairn and Eastern side of the Great Glen. |
| Parent Unit: |
Grampian Group (GRAM)
|
| Previous Name(s): |
Glenshirra Succession [Obsolete Name and Code: Use GRGL]
(-4685)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Upper Spey Valley above Spey Dam. Includes Glenshirra Forest, Creag Mhor and Creag Beag. |
| Reference(s): |
| Haselock, P J, Whinchester, J A and Whittles, K H, 1982. The stratigraphy and structure of the southern Monadhliath Mountains between Loch Killin and Upper Glen Roy. Scottish Journal of Geology, Vol. 18, p. 275 - 290. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S063
S063
S073
S073
S074
|
