The BGS Lexicon of Named Rock Units — Result Details

Beinn Mheadhoin Pebbly Psammite Formation

Computer Code: BMPP Preferred Map Code: BM
Status Code: Pending Upgrade
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Feldspathic psammite (arkosic) with thin semipelite beds and gritty beds with abundant quartz and feldspar clasts.
Definition of Lower Boundary: Not exposed; unknown.
Definition of Upper Boundary: Conformably overlain by Ruthven Semipelite Formation, sharp disconformity and marked lithological change from psammitic sequence to gneissose semipelite.
Thickness: none recorded or not applicable
Geographical Limits: Central Highlands of Scotland E of Great Glen fault - Strathnairn area. Sheet 73E (Foyers).
Parent Unit: Glenshirra Subgroup (GRGL)
Previous Name(s): Gairbeinn Psammite Formation (-708)
Alternative Name(s): none recorded or not applicable
Type Area  Beinn Mheadhoin - summit area and northern ridge. 
Reference Section  Cairn Poullachie - minor hill south of B851. 
Type Section  Ridge between Beinn Bhuidhe and Garbhal Mor. 
British Geological Survey, 1996. Foyers Scotland Sheet 73E. Solid geology 1:50000 [Keyworth, Nottingham, British Geological Survey]. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: