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 [Obsolete Name and Code: Use TUMQ]
(-1876)
Tummel Quartzite [Obsolete Name and Code: Use TUMQ] (-2502) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Section | Creag na Caisean, north of Loch Tummel. | ||
| Reference(s): | |||
| 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. | |||
| 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. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| S055 S055 | |||