The BGS Lexicon of Named Rock Units — Result Details

Braicklaich Sand Member

Computer Code: BRSA Preferred Map Code: BS
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Sand, silty sand and silt, rhythmically bedded, pale yellowish brown, capped by sand and gravel. Individual beds are generally graded sand/silt couplets, 0.2 to 0.4m thick, with planar or ripple-drift cross lamination. The beds are stacked into packages and are probably glaciomarine cyclopsams.
Definition of Lower Boundary: Not observed but probably conformable on the Finglack Till Formation.
Definition of Upper Boundary: Ground surface or sharp, gently undulating, unconformable contact with raised beach deposits.
Thickness: 7m
Geographical Limits: Alturlie Peninsula and the southern shore of the Inner Moray Firth east of Inverness. Sheet 84W.
Parent Unit: Alturlie Gravels Formation (ALGR)
Previous Name(s): Glacial sand and gravel [Obsolete Name and Code] (GSG)
Braicklaich Sands Member [Obsolete Name and Code: Use BRSA] (-1392)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Sand and gravel pit beside the railway at Milton of Braicklaich (now renamed Milton of Gollanfield), and dug into a northeasterly-trending ridge. 
Reference(s):
Fletcher, T P et al. 1996. Geology of the Fortrose and eastern Inverness district. Memoir of the British Geological Survey, Sheet 84W (Scotland). 
Merrit, 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 deglaciation of a major ice stream of the British Late Devensian ice sheet. Quaternary Science Reviews, Vol.14, 289-329. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S084