The BGS Lexicon of Named Rock Units — Result Details

Burn Of Mar Sandstone Formation

Computer Code: BMSA Preferred Map Code: notEntered
Status Code: Full
Age range: Abereiddian Stage (O2) — Caradoc Series (O4)
Lithological Description: A medium to coarse-grained and weakly cleaved, lithic sandstone arenite, which contains chloritised grains, possibly after serpentine, and chromite grains.
Definition of Lower Boundary: Not seen, as either faulted against younger or older rocks, or juxtaposed against sheared and silicified serpentinite.
Definition of Upper Boundary: Not seen, as either faulted or unconformably overlain by Upper Devonian, Upper Old Red Sandstone Facies strata.
Thickness: At least 200 m thick.
Geographical Limits: Isolated slivers within the Highland Boundary Fault system between Loch Lomond (Balmaha) and Gualann. 1:50k sheets 38W (Ben Lomond) and 38E (Aberfoyle).
Parent Unit: Highland Border Complex (HBX)
Previous Name(s): Loch Lomond Clastics (-4479)
Highland Border Sandstones (-2002)
Highland Border Grits [Obsolete Name And Code: Use BMSA] (HBGR)
Alternative Name(s): none recorded or not applicable
Type Area  Lakeside exposures around Arrochymore Point, on the eastern side of Loch Lomond. Bluck, 1992. 
Type Section  Short stream section in the Burn of Mar, 800 m northeast from Conic Hill. 
Bluck, BJ. 1992. Balmaha. 110-129 in Lawson, JD, and Weedon, DS. (editors) Geological excursions around Glasgow and Girvan. Geological Society of Glasgow. 
Anderson, J G C. 1946. The Geology of the Highland Border: Stonehaven to Arran. Transactions of the Royal Society of Edinburgh, Vol.61, 479-515. 
Tremlett, WE. 1973. Excursion 9: Balmaha. 75-81 in Bluck, BJ. (editor) Excursion guide to the geology of the Glasgow district. Geological Society of Glasgow. 
Curry, G B, Bluck, B J, Burton, C J, Ingham, J K, Siveter, D J and Williams, A. 1984. Age, evolution and tectonic history of the Highland Border Complex, Scotland. Transactions of the Royal Society of Edinburgh: Earth Sciences, Vol.75, 113-133. 
Henderson, W G and Robertson, A H F, 1982. The Highland Border rocks and their relation to marginal basin development in the Scottish Caledonides. Quarterly Journal of the Geological Society of London, Vol.139, p.433-450. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S038 S038 S038