Computer Code: |
KESA |
Preferred Map Code: |
KESA |
Status Code: |
Full |
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 Applicable (-)
|
Previous Name(s): |
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
|