The BGS Lexicon of Named Rock Units — Result Details

Culdoich Till Member

Computer Code: CUTI Preferred Map Code: CULT
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Pebbly silty clay diamicton containing shell fragments of high-boreal to low-arctic aspect, clasts typically well rounded, high sphericity.
Definition of Lower Boundary: Sharp, unconformable or glacitectonic boundary with either bedrock or the Cassie Till Formation.
Definition of Upper Boundary: Sharp, unconformable, glacitectonic boundary with the Dalroy Sand Member.
Thickness: 2.5m at type section.
Geographical Limits: Sheet NH74SE.
Parent Unit: Clava Shelly Formation (CLSH)
Previous Name(s): Clava Shelly Till Member [Obsolete Name And Code: Use CUTI] (CLST)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Lectostratotype (after Peacock, 1975, section III). River cliff section of Cassie Burn. Section NH74SE/E9 on 'standard' map. 
Reference(s):
Horne, J and others, 1894. The character of the high-level shell-bearing deposits at Clava, Chapelhall and other localities. Report of the British Association for the Advancement of Science for 1883, p.483-514. 
Peacock, J D, 1975. Depositional environment of glacial deposits at Clava, north-east Scotland. Bulletin of the Geological Survey of Great Britain, No.49. 31-37. 
Merritt, J W 1992. The high-level marine shell-bearing deposits of Clava, Inverness-shire, and their origin as glacial rafts. Quaternary Science Reviews, Vol.11, 759-777. 
Merritt, J W, 1990. The lithostratigraphy at Clava, Inverness-shire and a new model for the origin of its shell-bearing deposits as glacially-transported allochthons. "In" Auton, C A, Firth, C R and Merritt, J W. (Editors). Beauly to Nairn: Field Guide. Quaternary Research Association, Cambridge. 
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