The BGS Lexicon of Named Rock Units — Result Details

Sailmhor Formation

Computer Code: SMH Preferred Map Code: notEntered
Status Code: Full
Age range: Tremadoc Series (O1) — Tremadoc Series (O1)
Lithological Description: Dark grey, massive granular dolostones with dark and pale mottling and conspicuous developments of white and pink diagenetic chert nodules and layers.
Definition of Lower Boundary: Conformably overlies pale grey flaggy dolostones of the Eilean Dubh Formation.
Definition of Upper Boundary: Conformably overlain by fine-grained, pale cream coloured dolostones of the Sangomore Formation.
Thickness: About 130 m thick.
Geographical Limits: The Durness Group, containing the Sailmhor Formation, forms a narrow, discontinuous belt, extending along the north-western side of Scotland from the Durness-Eriboll area, through Assynt and Kishorn, to Skye.
Parent Unit: Durness Group (DNG)
Previous Name(s): Sailmhor Group (-4333)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Coast at Ord, south side of Loch Eishort, southern Skye. Peach et al., 1907. 
Reference Section  South coast of Balnakeil Bay, Durness area, north coast of Scotland. The formation is also well exposed on the east side of Sango Bay and on the east side of the Kyle of Durness. Peach et al., 1907; Prigmore and Rushton ,1999. 
Reference(s):
Phemister, J. 1948. British Regional Geology: Scotland: the Northern Highlands (2nd edition) (Edinburgh: HSMO for the Geological Survey and Museum.) 
Peach, B N, Home, J, Gunn, W, Clough, C T and Hinxman, L W, 1907. The Geological Structure of the northwest Highlands of Scotland. Memoir of the Geological Survey of Great Britain. 
Cowie, J W. 1974. The Cambrian of Spitsbergen and Scotland. 123-155 in Cambrian of the British Isles, Norden and Spitsbergen, Holland, C H (editor). Lower Palaeozoic Rocks of the World, Vol. 2. (John Wiley and Sons.) 
Lapworth, C. 1883. The secret of the Highlands. Geolgical Magazine, Decade 2, Vol. 10, 120-128, 193-199, 337-344. 
Johnston, G S and Mykura, W. 1989. British regional geology: the Northern Highlands (4th edition) (London: HMSO for the British Geological Survey.) 
Park, E G, Stewart, A D and Wright, D T. 2002. The Hebredean Terrane. 45-80 in the Geology of Scotland. Trewin, N H (Editor). (The Geological Society, London.) 
Prigmore, J K and Rushton, A W A. 1999. Scotland: Cambrian and Ordovician of the Hebridean Terrane. 295-315 in British Cambrian to Ordovician Stratigraphy. Rushton, A W A, Owen, A W, Owens, R M and Prigmore, J K (editors). Geological Conservation Review Series. (Joint Nature Conservation Committee.) 
Wright, D T and Knight, I. 1995. A revised chronostratigraphy for the lower Durness Group. Scottish Journal of Geology, Vol. 31, 11-22. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S114 S071 S101 S102 S108 S107