The BGS Lexicon of Named Rock Units — Result Details

Kessock Bridge Silt Formation

Computer Code: KEBR Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Clayey silt and fine-grained sand with well dispersed, angular lithic pebbles, chiefly of psammite and sandstone. Shell fragments particularly common towards the top of the unit. Contains a mid-boreal, shallow water fossil assemblage of Windermere Interstadial age.
Definition of Lower Boundary: Conformable contact with Ardersier Silt Formation.
Definition of Upper Boundary: Erosional contact with Longman Gravel Formation.
Thickness: To 30m
Geographical Limits: Area around the Inner Moray Firth and Beauly Firth, Inverness. Geological Sheet 84W (Fortrose).
Parent Unit: British Coastal Deposits Group (COAS)
Previous Name(s): Kessock Bridge Formation (-4115)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Commercial boreholes drilled along the line of the Kessock Bridge, Inverness. Peacock, J D and Wilkinson, I P - in Merritt, et al., 1995. 
Reference(s):
Peacock, J D. 1977. Subsurface deposits of Inverness and the Inner Cromarty Firth. 103-104 in Gill, G (editor), Moray Firth Area Geological Studues. [Inverness Field Club]. 
Fletcher, T P et al. 1996. Geology of the Fortrose and eastern Inverness district. Memoir of the British Geological Survey, Sheet 84W (Scotland). 
Peacock, J D and Wilkinson, I P, 1995. Appendix, Kessock Biostratigraphy. 289-329 in Merritt, J W, Auton, C A and Firth, C R. 1995. Ice-proximal glaciomarine sedimentation and sea-level change in the Inverness area, Scotland: A review of the deglacial history of a major ice stream of the British Late Devensian Ice Sheet. In: Quaternary Science Reviews, Vol.14(3). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S084