The BGS Lexicon of Named Rock Units — Result Details

Beinn Bhreac Psammite Formation

Computer Code: BBPS Preferred Map Code: BB
Status Code: Full
Age range: Tonian Period (AT) — Tonian Period (AT)
Lithological Description: Gneissose interbanded psammite, micaceous psammite and siliceous psammite. Locally migmatitic.
Definition of Lower Boundary: Conformable contact with Creag Bhuidhe Semipelite (CGBH); contact is poorly exposed
Definition of Upper Boundary: Overlain by Flichity Semipelite Formation (FLTY) with a transitional, locally sheared contact. No way-up criteria.
Thickness: none recorded or not applicable
Geographical Limits: Central Highlands, SE of Loch Ness, Strathnairn to Strathdean, Slochd area.
Parent Unit: Dava Subgroup (DAVA)
Previous Name(s): Beinn Bhreac Psammite [Obsolete Name and Code: Use BBPS] (-2580)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  On the ridge east of Mains of Flichity [NH 686 290]. 
Type Area  On the hill Beinn Bhreac, at [NH 757 276]. 
Reference Section  On the crags north of Brin Rock [NH 662 300]. 
Reference(s):
Krabbendam, M. 2021. A stratigraphic framework for the early Neoproterozoic successions of the Northern Highlands of Scotland. UK Stratigraphic Framework Series. British Geological Survey Open Report, OR/21/072. 86pp. 
Leslie, A G, Robertson, S, Smith, M, Banks, C J, Mendum, J R, and Stephenson, D. 2013. The Dalradian rocks of the northern Grampian Highlands of Scotland. Proceedings of the Geologists' Association, Vol. 124, 263-317. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S074