The BGS Lexicon of Named Rock Units — Result Details

Basal Quartz Sandstone Formation

Computer Code: BQS Preferred Map Code: BQS
Status Code: Full
Age range: Early Devonian Epoch (DL) — Early Devonian Epoch (DL)
Lithological Description: Quartz and schist breccia, with beds of sandstone, red and grey shale, and subsidiary quartz conglomerate.
Definition of Lower Boundary: Unconformable on rocks of the Dalradian Supergroup.
Definition of Upper Boundary: The base of the Auchencar Sandstone Formation.
Thickness: 240 m thick.
Geographical Limits: Isle of Arran.
Parent Unit: Arbuthnott-Garvock Group (ATGK)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Area  Allt Mhic Gilleregish 
Friend, P F, Harland, W B and Hudson, J D, 1963. The Old Red Sandstone and the Highland Boundary in Arran, Scotland. Transactions of the Edinburgh Geological Society, Vol.19, 363-425. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: