The BGS Lexicon of Named Rock Units — Result Details
Strath Fionan Banded Semipelite Formation
| Computer Code: | SFBS | Preferred Map Code: | SFBS |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ) | ||
| Lithological Description: | Rusty-weathering interbedded semipelite and pelite, with muscovite and biotite; cross-lamination and graded bedding well-preserved on 10-100mm scale; calcareous beds occur in places. | ||
| Definition of Lower Boundary: | Sharp boundary from lineated quartzite with feldspathic laminae at top of Meall Dubh Quartzite Formation. | ||
| Definition of Upper Boundary: | Transitional boundary to limestone of Strath Fionan Pale Limestone Formation. | ||
| Thickness: | 0 - 60m in Sheet 55W; probably some tectonic thinning. | ||
| Geographical Limits: | From Allt na Moine Buidhe [NN 7076 6110] to south bank of Allt Kinardochy [NN 7789 5727]. Not present east of the Loch Tay Fault, where its place is taken by the lower part of the Monzie Limestone and Schist Formation. | ||
| Parent Unit: | Ballachulish Subgroup (DABH) | ||
| Previous Name(s): | Monzie Limestone and Schist Formation [Obsolete Name and Code: Use SFBS, SFPL, TULS]
(-4323)
Strath Fionan Banded Formation [Obsolete Name and Code: Use SFBS] (-3028) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Section | Allt Strath Fionan, c.1km west-north-west of Braes of Foss, along to line B-B' (Fig.4 of Treagus, J E. 2001). | ||
| Reference(s): | |||
| Treagus, J E and King, G, 1978. A complete Lower Dalradian succession in the Schiehallion district, central Perthshire. Scottish Journal of Geology, Vol.14, 157-166. | |||
| 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. | |||
| Smith, R A and Harris, A L, 1976. The Ballachulish rocks of the Blair Atholl district. Scottish Journal of Geology, Vol.12, 153-157. | |||
| 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 | |||