The BGS Lexicon of Named Rock Units — Result Details
Braicklaich Sand Member
Computer Code: | BRSA | Preferred Map Code: | BS |
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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) |
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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 |