The BGS Lexicon of Named Rock Units — Result Details

Auchencar Sandstone Formation

Computer Code: AUSA Preferred Map Code: notEntered
Status Code: Full
Age range: Early Devonian Epoch (DL) — Early Devonian Epoch (DL)
Lithological Description: Red lithic sandstones, quartzite conglomerates and lava pebble conglomerates common towards the top of the succession, withnd one grey pyroxene andesite lava intercalation.
Definition of Lower Boundary: The top of the Basal Quartz Sandstone Formation.
Definition of Upper Boundary: The sandstone of the Auchencar Sandstone Formation, and the top of the Creag Mhor Conglomerate Member are overlain by the base of the Machrie Burn and Allt an Brighide Siltstones of the Am Binnein Sandstone Formation.
Thickness: About 450 - 500 m thick.
Geographical Limits: Machrie to Glen Rosa, Arran.
Parent Unit: Arbuthnott-Garvock Group (ATGK)
Previous Name(s): Creag Mhor Conglomerates (-661)
Torr Breac Sandstones (-32)
Auchencar Lava (-1959)
Auchencar Burn Sandstones (-1319)
Alternative Name(s): none recorded or not applicable
Partial Type Section  The lower part of the formation, in the Auchencar Burn. Browne, et al., 2000; Friend, et al., 1963. 
Partial Type Section  The upper part of the formation, in the Machrie Burn. Browne, et al., 2000; Friend, et al., 1963. 
Browne, M A E, Smith, R A and Aitken, A M. 2001. A lithostratigraphical framework for the Devonian (Old Red Sandstone) rocks of Scotland south of a line from Fort William to Aberdeen. Version 3. British Geological Survey Research Report RR/01/04. 
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: