The BGS Lexicon of Named Rock Units — Result Details

Reidh Psammite Formation

Computer Code: REP Preferred Map Code: notEntered
Status Code: Full
Age range: Tonian Period (AT) — Tonian Period (AT)
Lithological Description: Coarse, locally gritty psammite, gneissose, commonly migmatitic; interbanded with gneissose pelite, semipelite and quartzite.
Definition of Lower Boundary: Overlies Lewisian Gneiss (L) inlier (as at Monar); elsewhere overlies the Sgurr Beag Thrust; with Morar Group beneath.
Definition of Upper Boundary: Overlain by the Lochailort Pelite Formation (MBLA), likely conformable.
Thickness: Highly variable, possibly up to 1 km.
Geographical Limits: Northern Highlands, Morar to Dornoch Firth. Restricted to the Sgurr Beag Nappe.
Parent Unit: Glenfinnan Group (GLEN)
Previous Name(s): Reidh Psammite [Obsolete Name and Code: Use REP] (-4294)
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
Strachan, R A, May, F and Barr, D, 1988. The Glenfinnan and Loch Eil Divisions of the Moine Assemblage. 32-45 IIV Winchester, J A (editor). Later Proterozoic stratigraphy of the Northern Atlantic regions (Glasgow and London: Blackie). 
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. 
Tanner, P W G. 1971. The Sgurr Beag Slide - a major tectonic break within the Moinian of the Western Highlands of Scotland. Quarterly Journal of the Geological Society, Vol. 126, 435-463. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S083 S062