The BGS Lexicon of Named Rock Units — Result Details

Garva Bridge Psammite Formation

Computer Code: GABR Preferred Map Code: GV
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Feldspathic psammite, micaceous psammite and schistose semipelite.
Definition of Lower Boundary: Not exposed.
Definition of Upper Boundary: Sharp but conformable boundary with overlying Core nan Laogh Semipelite. Contact locally sheared, probably a disconformity.
Thickness: min. 2 km.
Geographical Limits: Central Highlands of Scotland, sheet 73E, 63E, 63W, southern Monadhliath Mountains.
Parent Unit: Glenshirra Subgroup (GRGL)
Previous Name(s): Gairbeinn Psammite Formation (-708)
Alternative Name(s): none recorded or not applicable
Type Section  Section in Allt a Ghamnha at Garva Bridge. 
Reference Section  Section in Allt Coire Iain Oig. 
Robertson, S and Merritt, J W [in prep.]. Geology of the Dalwhinnie district. Sheet description of 1:50000 sheet 63E [Scotland]. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S063 S073 S063