The BGS Lexicon of Named Rock Units — Result Details

Kerrera Sandstone Formation

Computer Code: KESA Preferred Map Code: KESA
Status Code: Pending Upgrade
Age range: Pridoli Epoch (SO) — Early Devonian Epoch (DL)
Lithological Description: Mainly green and red sandstones with conglomerates and subordinate siltstones, mudstones and limestones.
Definition of Lower Boundary: An unconformity with the Dalradian Supergroup below.
Definition of Upper Boundary: The incoming of the Lorn Plateau Volcanic Formation, locally laterally interfingering with the sandstones.
Thickness: Up to 128m thick on Kerrera.
Geographical Limits: Argyll, Scotland.
Parent Unit: Not Entered (?)
Previous Name(s): Lorne Sedimentary 'Series' (-2873)
Lorn Sedimentary "Series" [Obsolete Name And Code: Use KESA] (LOSS)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Coastal section at the southern end of the island of Kerrera. Lee and Bailey, 1925. 
Reference(s):
Marshall, J E A, 1991. Palynology of the Stonehaven Group, Scotland: Evidence for a mid-Silurian age and its geological implications. Geological Magazine, Vol.128 (3), p.283-286. 
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. 
Lee, G W and Bailey, E B. 1925. The pre-Tertiary Geology of Mull, Loch Aline and Oban. Memoir of the Geological Survey of Great Britain, parts of Sheets 35, 43, 44, 45 and 52 (Scotland). 
Morton, D J, 1979. Palaeogeographical evolution of the Lower Old Red Sandstone Basin in the western Midland Valley. Scottish Journal of Geology, Vol.15, 97-116, Fig.1 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S044 S045