The BGS Lexicon of Named Rock Units — Result Details

Torridon Group

Computer Code: TC Preferred Map Code: notEntered
Status Code: Full, pending ratification
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Unmetamorphosed red beds with subordinate grey shaly mudstones.
Definition of Lower Boundary: Drawn at the base of the Diabaig Formation (Torridon Group) where it rests unconformably on the Stoer Group.
Definition of Upper Boundary: Drawn where the Cailleach Head Formation is overlain by superficial deposits.
Thickness: 7km
Geographical Limits: Rum to Cape Wrath, west Scotland.
Parent Unit: Not Applicable (-)
Previous Name(s): Torridon Sandstone (-3073)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Loch Torridon, Highland Region. 
Reference(s):
Peach, B N and others. 1907. The Geological Structure of the North-west Highlands of Scotland. Memoir of the Geological Survey of Great Britain. 
Stewart, A D. 1966. On the correlation of the Torridonian between Rhum and Skye. Geological Magazine, Vol.103, 432-439. 
Williams, G E, 1966. Palaeogeography of the Torridonian Applecross Group. Nature, London. 
Stewart, A D. 1969. Torridonian rocks of Scotland Reviewed. "In" Kay, M, (Editor). North Atlantic - geology and Continental Drift: A symposium. Memoir of the American Association of Petrological geology, Vol.12, p.595-608. 
Selley, R C. 1965. Diagnostic characters of fluviatile sediments of the Torridonian Formation (Pre-Cambrian) of north west Scotland. Journal of Sedimentary Petrology. 
Selley, R C and Stewart, A D. 1967. The Torridonian sediments of north-west Scotland. International Congress of Sedimentological Excursion Guide C2. 
Gracie, A.J. and Stewart, A.D., 1967. Torridonian sediments at Enard Bay, Ross-shire. Scottish Journal of Geology, 3: 181-194. 
Black, G P and Welsh, W, 1961. The Torridonian succession of the Isle of Rhum. Geological Magazine, Vol.98, 265-276. 
Welsh, W. 1963. Sedimentary features of the Rhum Torridonian. Transactions of the Geological Society of Edinburgh, Vol.19, 486-492. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S114 S071 S071 S107 S108 S081 S082 S092 S092 S101 S101 S081 S102 S113 S070 S060 S091