The BGS Lexicon of Named Rock Units — Result Details

Salterella Grit Member

Computer Code: SGQ Preferred Map Code: notEntered
Status Code: Full
Age range: Comley Series (EC) — Comley Series (EC)
Lithological Description: White quartz arenite and quartzite, characterised by small conical Salterella shells.
Definition of Lower Boundary: Conformably overlies the Fucoid Beds Member of the An t-Sron Formation.
Definition of Upper Boundary: Conformably overlain by dark grey dolostones of the Ghrudaidh Formation of the Durness Group.
Thickness: Up to 20 m thick, but generally less than 15 m thickness.
Geographical Limits: The An t-Sron Formation, including the Salterella Grit Member, forms a narrow, discontinuous belt, extending along the North-western side of Scotland from the Durness-Eriboll area, through Assynt, Dundonnell, Kinlochewe and Kishorn, to Skye.
Parent Unit: An T-Sron Formation (ASR)
Previous Name(s): Serpulite Grit Member [Obsolete Name And Code: Use SGQ] (SLGT)
Salterella Grit Or Quartzite (-1815)
Salterella Grit (-4880)
Salterella Grit Formation (-2417)
Serpulite Grit (-2418)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Skiag Bridge by Loch Assynt displays a good reference section through the Salterella Grit Member. Peach et al., 1907. 
Type Area  An T-Stron headland on east shore of Loch Eriboll, Durness area, north coast of Scotland. Peach et al., 1907; Prigmore and Rushton, 1999. 
Reference(s):
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.) 
Johnson, M R W and Parsons I. 2000. Macgregor and Phemister's geological excursion guide to the Assynt district of Scotland. (Edinburgh Geological Society.) 
Holland, C H (Editor). Lower Palaeozoic Rocks of the World, Vol.2. (John Wiley & Sons.) 
Phemister, J. 1948. British Regional Geology: Scotland: the Northern Highlands (2nd edition) (Edinburgh: HSMO for the Geological Survey and Museum.) 
Wright, D T and Knight, I. 1995. A revised chronostratigraphy for the lower Durness Group. Scottish Journal of Geology, Vol. 31, 11-22. 
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. 
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.) 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S114 S071 S108 S081 S082 S092 S092 S101 S102 S107