The BGS Lexicon of Named Rock Units — Result Details

Cantray Till Member

Computer Code: CYTI Preferred Map Code: CAN
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Stony sandy clay diamicton, matrix supported, "strong brown" (Munsell Soil) to dark yellowish brown, fissile, massive, extremely compact, containing angular to subrounded clasts of gneissose psammite and semipelite, granite and Devonian sandstone and siltstone. Typical lodgement till with well developed north-easterly fabric and containing concavo-convex discontinuities that are commonly sand-filled. Commonly includes rip-up masses of the underlying till unit (Athais Till Formation).
Definition of Lower Boundary: Either a planar, gradational contact over 10 to 20cm with underlying stony, clayey, sandy diamictions of the Athais Till Formation, or a sharp, planar, glacitectonic boundary with that Formation. Locally filling wedge structures in the top surface of the Athais Till Formation.
Definition of Upper Boundary: Generally a gradational contact, but a sharp change in colour, with dark yellowish brown stony sandy clay diamicton of the overlying Ruallan Till Member.
Thickness: 6.5m
Geographical Limits: Sheet 84W (Fortrose), southeast of Inverness.
Parent Unit: Beinn an Uain Till Formation (BUTI)
Previous Name(s): Dalcharn Upper Till Formation [Obsolete Name and Code: Use CYTI] (-1472)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Exposed in river cliff section of the Allt Dearg, 6km southwest of Cawdor, Nairnshire, in the vicinity of the Dalcharn Interglacial Site. Walker, M J C and 6 others. 1992. 
Reference(s):
Sutherland D G and Gordon, J E. (editors). 1993. The Quaternary of Scotland. Geological Conservation Review Series: 6. London: Chapman and Hall. 
Fletcher, T P et al. 1996. Geology of the Fortrose and eastern Inverness district. Memoir of the British Geological Survey, Sheet 84W (Scotland). 
Walker, M J and 6 others. 1992. Allt Odhar and Dalcharn: two pre-Late Devensian (Late Weichselian) sites in northern Scotland. Journal of the Quaternary Science, Vol.7, 69-86. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S084