The BGS Lexicon of Named Rock Units — Result Details
Ben Wyvis Pelite Formation
Computer Code: | BWYP | Preferred Map Code: | SYMB |
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Status Code: | Full | ||
Age range: | Tonian Period (AT) — Tonian Period (AT) | ||
Lithological Description: | Coarse pelitic gneiss, garnetiferous, locally migmatitic, with gneissose semipelite and psammite. Quartzite occurs locally. Calcsilicate bands are common within psammite. | ||
Definition of Lower Boundary: | Overlies conformably the Reidh Psammite Fm (REP); where predominantly siliceous psammitic lithologies pass into predominantly pelitic lithologies. | ||
Definition of Upper Boundary: | Overlain by the Tarvie Psammite Formation (TAPS) - Loch Eil Group, where predominantly pelitic lithologies pass eastwards into predominantly psammitic lithologies. | ||
Thickness: | Highly variable, possibly up to 2-3 km. | ||
Geographical Limits: | Northern Highlands: Glen Affric to Dornoch Firth. Restricted to the Sgurr Beag Nappe. | ||
Parent Unit: | Glenfinnan Group (GLEN) | ||
Previous Name(s): | Ben Wyvis Pelite [Obsolete Name and Code: Use BWYP]
(-4508)
Ben Wyvis Pelitic Schist [Obsolete Name and Code: Use BWYP] (-4509) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Area | Tom na Chaillich. | ||
Reference(s): | |||
Wilson, D. 1975. Structure and metamorphism of the Ben Wyvis District, Ross-shire. (University of Edinburgh: Unpublished PhD thesis.) | |||
Grant, C J. 1989. The kinematics and tectonic significance of ductile shear zones within the Northern Highland Moine. (University of Liverpool: unpublished PhD thesis.) | |||
Holdsworth, R E, Strachan, R A and Harris, A L, 1994. Precambrian rocks in northern Scotland east of the Moine Thrust: The Moine Supergroup in Gibbons, W and Harris, A L (editors). A revised correlation of Precambrian rocks in the British Isles. Special Report of the Geological Society, No.22. | |||
Strachan, R A, May, F and Barr, D, 1988. The Glenfinnan and Loch Eil Divisions of the Moine Assemblage. 32-45 IIV Winchester, J A (editor). Later Proterozoic stratigraphy of the Northern Atlantic regions (Glasgow and London: Blackie). | |||
Roberts, A M, Strachan, R A, Harris, A L, Barr, D and Holdsworth, R E, 1987. The Sgurr Beag Nappe: A reassessment of the stratigraphy and structure of the Northern Highland Moine. Geological Society of America Bulletin, Vol.98, 497-506. | |||
Krabbendam, M. 2021. A stratigraphic framework for the early Neoproterozoic successions of the Northern Highlands of Scotland. UK Stratigraphic Framework Series. British Geological Survey Open Report, OR/21/072. 86pp. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
S093 S093 S093 |