The BGS Lexicon of Named Rock Units — Result Details

Reay Burn Till Formation

Computer Code: REBU Preferred Map Code: symb
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Diamicton, clayey and sandy, typically reddish brown to pale yellowish brown, boulder-sized clasts mainly of Orcadian Devonian sandstones, conglomerates, siltstones and mudstones where overlying Devonian strata, otherwise mainly of Caledonian igneous and Moine metamorphic rocks (Thormaid Till Member) when overlying or near basement outcrops.
Definition of Lower Boundary: Unconformable on bedrock.
Definition of Upper Boundary: Overlain by Holocene strata.
Thickness: To 10m
Geographical Limits: Caithness and Sutherland mainly east of a line between Reay and Berridale (1:50 000 sheets 115E and W, and sheet 100).
Parent Unit: Northwest Highlands Glacigenic Subgroup (NWHG)
Previous Name(s): Reddish Brown Ground Moraine (-2997)
Reay Till (-4489)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  River cliff on the western side of Reay Burn, about 50m upstream of its mouth (at Mean High Water Springs) on Sandside Beach. Omand, 1973, p.38. 
Reference Section  A cliff section on the eastern side of Sandside Bay, about 200m north of the mouth of the Burn of Isauld, BGS Registered Field Locality CA 1409. 
Reference(s):
Auton, C A, Entwisle, D C and Golledge, N R. 2001. Dounreay catchment Quaternary Characterisation study: final interpretation report. British Geological Survey commissioned Report, CR/01/116. 122pp. 
Peach, B N and Horne, J, 1881. The glaciation of Caithness. Proceedings of the Royal Physical Society of Edinburgh, Vol. 6, p.316-352. 
Omand, D. 1973. The glaciation of Caithness. Unpublished MSc Thesis, University of Strathclyde. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S116 S110