The BGS Lexicon of Named Rock Units — Result Details

Tummel Quartzite Formation

Computer Code: TUMQ Preferred Map Code: TumQ
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Dominantly white quartzite, in mappable layers up to 30m thick, interbedded with thicker units of laminated cleaved psammite rich in dune-bedding, ripple cross-lamination and soft-sediment deformation structures.
Definition of Lower Boundary: Gradational boundary with underlying Bruar Psammite Formation.
Definition of Upper Boundary: Gradational bundary with overlying Tummel Psammite Formation.
Thickness: 10 - 1800m
Geographical Limits: From west of Meall a'Chataidh [NN 737 680] via Drumcroy Hill [NN 72 63] to core of Meall Reamhar Synform [NN 76 59]. On southern side of Meall Reamhar Synform outcrop continues via Creag nan Caisean [NN 783 605] to River Garry at Tomban [NN 825 654]; and on northern side of Meall Reamhar Synform via Craig of Tulloch [775 625] to An Teampan [787 653]. This limb is faulted out in the River Garry section, but the formation reappears north of Clunes and may continue as far as Dalinturaine [NN 76 69].
Parent Unit: Strathtummel Subgroup (STEL)
Previous Name(s): Tummel Quartzites With Laminated Psammites (-1876)
Tummel Quartzite (-2502)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Creag na Caisean, north of Loch Tummel. 
Reference(s):
Stephenson, D and Gould, D , 1995. British Regional Geology: the Grampian Highlands (4th edition). (London: HMSO for the British Geological Survey), 67-68. 
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). 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S055 S055