The BGS Lexicon of Named Rock Units — Result Details

Gairbeinn Pebbly Psammite Member

Computer Code: GAIR Preferred Map Code: GV
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Pink, grey and fawn feldspathic psammite and micaceous psammite with pebbly layers, particularly towards the top of the member.
Definition of Lower Boundary: Transitional, placed where feldspar clasts and pebble bands become abundant within the Garva Bridge Psammite Formation.
Definition of Upper Boundary: Abrupt and locally transitional over a few metres. Placed where highly strained pebbly psammite, psammite and some quartzite are overlain by schistose to gneissose semipelite.
Thickness: up to 700 m.
Geographical Limits: Western part of Monadhliath Mountains in Central Highlands. Mostly in NW part of sheet 63E [Dalwhinnie] and on sheet 73E [Foyers].
Parent Unit: Garva Bridge Psammite Formation (GABR)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Section  Northern and western walls of Garbh Coire. 
Glover, B W. 1998. Sedimentology and lateral extent of the Glenshirra Succession, Monadhliath Mountains, Scotland, British Geological Survey Technical Report WA/98/23. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S063 S063 S073