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
Stratotypes:
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. 
Reference(s):
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