The BGS Lexicon of Named Rock Units — Result Details

Achnacarry Striped Formation

Computer Code: ACNS Preferred Map Code: symb
Status Code: Full
Age range: Tonian Period (AT) — Tonian Period (AT)
Lithological Description: Gneissose psammite and semipelite, interbanded. Locally calc-silicate bands.
Definition of Lower Boundary: Not exposed.
Definition of Upper Boundary: Likely conformable contact with the overlying Tarve Psammite Formation (Loch Eil Group), via a transitional boundary.
Thickness: none recorded or not applicable
Geographical Limits: Northern Highlands, along NW shore of Loch Lochy. Restricted to the Sgurr Beag Nappe.
Parent Unit: Glenfinnan Group (GLEN)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
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. 
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. 
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). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S062 S062