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 (-862)
West Sands Mica Schist Member (-3756)
West Sands Mica-Schist [Obsolete Code: See WESD] (DAWS)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  On the coast at West Sands Bay. 
Reference(s):
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). 
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). 
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