The BGS Lexicon of Named Rock Units — Result Details

West Sands Semipelite Member

Computer Code: WESD Preferred Map Code: WeSd
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Semipelite, micaceous, generally biotite-rich and garnetiferous.
Definition of Lower Boundary: Sharp change from feldspathic quartzite and psammite of the Sunnyside Sandstone Member (Cullen Quartzite Formation).Locally faulted (e.g. on coast section).
Definition of Upper Boundary: Transition to thin-bedded, flaggy psammite and semipelite within the Findlater Flag Formation.
Thickness: c.100m on coast section and inland.
Geographical Limits: From coast at West Sands [NJ 5375 6740], as far as Easter Bogs [NJ 410 630] (Sheet 95), where it is unconformably overlain by Devonian sedimentary rocks.
Parent Unit: Findlater Flag Formation (FIFL)
Previous Name(s): West Sands Mica-Schist [Obsolete Code: See WESD] (DAWS)
West Sands Mica Schist (-862)
West Sands Mica Schist Member (-3756)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  On the coast at West Sands Bay. 
Reference(s):
Harris, A L, Haselock, P J, Kennedy, M J and Mendum, J R, 1994. The Dalradian Supergroup in Scotland, Shetland and Ireland. 33-53 in Gibbons, W E and Harris, A L (editors). A revised correlation of Precambrian rocks in the British Isles. Special Report of the Geological Society, London, No.22. 
Stephenson, D and Gould, D , 1995. British Regional Geology: the Grampian Highlands (4th edition). (London: HMSO for the British Geological Survey), 67-68. 
Read, H H, 1923. Geology of the country around Banff, Huntly and Turriff, Lower Banffshire and north-west Aberdeenshire. Memoir of the Geological Survey, Scotland Sheets 86 and 96 (Scotland). 
Peacock, J D, Berridge, N G, Harris, A L, May, F. 1968. The geology of the Elgin District. Memoir of the Geological Survey of Scotland. Sheets 86 and 96 (Scotland). (Edinburgh: HMSO). 
Stephenson, D, et al. 1993. Stratigraphy and correlation of the Dalradian rocks of the East Grampian Project area. British Geological Survey Technical Report WA/93/91. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S096 S095