The BGS Lexicon of Named Rock Units — Result Details

Loch Maree Group

Computer Code: LMR Preferred Map Code: notEntered
Status Code: Full, pending ratification
Age range: Proterozoic Eon (AP) — Proterozoic Eon (AP)
Lithological Description: Hornblende and quartz-mica schists with minor graphitic, quartz-magnetite, quartz-carbonate and garnet-cummingtonite schists with sulphide horizons.
Definition of Lower Boundary: Drawn at base of interdigitated schists and gneisses of Loch Maree Group which rests unconformably on high grade acid gneisses of Badcallian age (Archaean).
Definition of Upper Boundary: Drawn at unconformable upward passage from schists of the Loch Maree Group to clastic rocks of the Torridonian including the Torridon Sandstone.
Thickness: Not known.
Geographical Limits: Gairloch and north-east of Loch Maree, north-west Highlands, Scotland.
Parent Unit: Not Applicable (-)
Previous Name(s): Loch Maree Series (-1035)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Gairloch, north-west Highlands, Scotland. 
Type Area  Loch Maree, north-west Highlands, Scotland. 
Reference(s):
Floyd, P A and others. 1989. Geochemistry and tectonic setting of Lewisian clastic metasediments from the early Proterozoic Loch Maree Group of Gairloch, north-west Scotland. Precambrian Research, Vol.45, p.203-214. 
Cattell, A. 1988. Anorthosite xenoliths in the Loch Maree Group meta-basalts. Scottish Journal of Geology, Vol.24 (3), 201-213. 
Jones, E and others, 1987. Lower Proterozoic stratiform sulphides deposits in Loch Maree Group, Gairloch, north-west Scotland. Transactions of the Institute of Mining and Metallurgy, Section B, Applied Earth Sciences, Vol.96, p.B128-B140. 
Hicks, H, 1883. On the metamorphic and overlying rocks in parts of Ross and Inverness-shire. Quarterly Journal of the Geological Society, Vol.39, p.141-159. 
Peach, B N and Horne, J, 1930. Chapters on the Geology of Scotland. [Oxford.] 
Peach, B N, 1913. The Geology of the Fannich Mountains and the country around Upper Loch Maree and Strath Broom. Memoirs of the Geological Survey of Great Britain, Scotland. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S092 S091