The BGS Lexicon of Named Rock Units — Result Details

Glenshirra Subgroup

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 (-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