The BGS Lexicon of Named Rock Units — Result Details

Kynachan Psammite Formation

Computer Code: KYPS Preferred Map Code: KynP
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Thickly-bedded schistose psammite. Relict bedding seen in lower few hundred metres, but more flaggy towards top. Cross-bedding well-developed, giving good younging directions. Minor quartzite units locally present.
Definition of Lower Boundary: Gradational boundary with underlying Kynachan Quartzite Formation.
Definition of Upper Boundary: Sharp, conformable boundary with Dunalastair Quartzite Formation.
Thickness: 0 - 700m
Geographical Limits: From Allt na Moine Buidhe near Mullinavadie [NN 713 611] via the south slopes of Creag Kynachan [NN 751 576] and the Allt Kynachan [NN 778 575] to the Loch Tay Fault [NN 802 598]. Also has small outcrop near the structural dome resulting from interference of the Clunes and Bohespic antiforms [NN 744 627].
Parent Unit: Strathtummel Subgroup (STEL)
Previous Name(s): Kynachan Psammite (-2277)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  South side of Creag Kynachan. 
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. 
Thomas, P R, 1980. The stratigraphy and structure of the Moine rocks north of the Schiehallion Complex, Scotland. Journal of the Geological Society, London, Vol.137, 469-482. 
Treagus, J E. 2001. Solid geology of the Schiehallion district. Memoir of the British Geological Survey, Sheet 55W (Scotland). 
Stephenson, D and Gould, D , 1995. British Regional Geology: the Grampian Highlands (4th edition). (London: HMSO for the British Geological Survey), 67-68. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S055