The BGS Lexicon of Named Rock Units — Result Details

Suidheig Till Formation

Computer Code: SUTI Preferred Map Code: notEntered
Status Code: Full
Age range: Anglian Stage (QA) — Wolstonian Stage (QO)
Lithological Description: Stony sandy clay diamicton, matrix-supported, moderate yellowish brown, extremely compact, containing clasts of Devonian sandstone and siltstone with some psammite, granite and schist. Many clasts are decomposed, especially petitic rocks and granite, with orange weathering rinds.
Definition of Lower Boundary: Uneven, unconformable contact with bedrock.
Definition of Upper Boundary: Erosional, undulating, unconformable contact with the Odhar Gravel Formation at the Allt Odhar Interstadial site, the Craig an Daimh Gravel Formation at the Dalcharn Interglacial site, or unconformable, planar contact with the Athais Till Formation elsewhere.
Thickness: 2m
Geographical Limits: Sheet 84W (Fortrose), southeast of Inverness.
Parent Unit: Inverness (Albion) Glacigenic Subgroup (IAG)
Previous Name(s): Dearg Till Formation (-3062)
Alternative Name(s): Dearg Member
Stratotypes:
Type Section  Exposed at the base of a river cliff of the Allt Odhar, immediately upstream of its confluence with the Caochan nan Suidheig, Moy Estate, 16km southeast of Inverness. The Allt Odhar Peat (Early Devensian Interstadial) occurs higher in the sequence. Walker, M J C and 6 others. 1992. 
Reference Section  River cliff sections of the Allt Dearg, 6km southwest of Cawdor, Nairnshire. Basal unit at the Dalcharn East Section [NH 8157 4537] at the Dalcharn Interglacial site. Walker, M J C and 6 others. 1992. 
Reference(s):
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. 
Sutherland D G and Gordon, J E. (editors). 1993. The Quaternary of Scotland. Geological Conservation Review Series: 6. London: Chapman and Hall. 
Sutherland, D G. 1999. Scotland. 99-114 in Bowen D Q (Editor), A revised correlation of Quaternary deposits in the British Isles. Special Report of The Geological Society of London, No.23. 
Fletcher, T P et al. 1996. Geology of the Fortrose and eastern Inverness district. Memoir of the British Geological Survey, Sheet 84W (Scotland). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S084