The BGS Lexicon of Named Rock Units — Result Details

Stratheden Group

Computer Code: SAG Preferred Map Code: SAG
Status Code: Full
Age range: Late Devonian Epoch (DU) — Late Devonian Epoch (DU)
Lithological Description: Sandstone, mainly red-brown and yellow, partly pebbly; subordinate red-brown siltstone and mudstone; local thick conglomerates in the west.
Definition of Lower Boundary: Angular unconformity. Base of Stockiemuir Sandstone (Gargunnock Sandstone) Formation in Dumbarton-Stirling area, where this rests on Strathmore Group. Base of Burnside Sandstone Formation in Fife and Kinross, where this rests on the Arbuthnott Group. Stratheden Group rests on Strathmore Group in Arran. The 'Upper Old Red' at Milton Ness (Montrose area) is probably the Kinnesswood Formation and of Carboniferous age, although the Strathededen Group may be present in the subsurface.
Definition of Upper Boundary: At base of Kinnesswood Formation (incoming of common pedogenic carbonate); boundary normally transitional, locally unconformable in west of Midland Valley, marking base of Inverclyde Group.
Thickness: Up to about 1500m thick.
Geographical Limits: Midland Valley of Scotland, Arran to north-east Fife. Sheets 12, Arran 21, 22, 29, 30E, 30W, 38W, 38E, 39E, 39W, 39E, 40W, 40E, 48W, 48E, 49.
Parent Unit: Not Applicable (-)
Previous Name(s): Upper Old Red Sandstone (UORS)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Stratheden and Lomond Hills area, Fife, Scotland (see type sections of components: Burnside, Glenvale, Dura Den, Knox Pulpit, Clashbenny, Stockiemuir Sandstones, Kelly Burn Sandstone, Wemyss Bay Sandstone, and Fairlie Sandstone formations). 
Reference(s):
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. 
Browne, M A E, 1980. The Upper Devonian and Lower Carboniferous (Dinantian) of the Firth of Tay, Scotland. Report of the Institute of Geological Sciences, No. 80/9. 
Paterson, I B and Hall, I H S, 1986. Lithostratigraphy of the late Devonian and early Carboniferous rocks in the Midland Valley of Scotland. British Geological Survey Report, 18/3. 
Chisholm, J I and Dean, J M, 1974. The Upper Old Red Sandstone of Fife and Kinross: A fluviatile sequence with evidence of marine incursion. Scottish Journal of Geology, Vol. 10, 1-30. 
Francis, E H, Forsyth, I H, Read, W A and Armstrong, M. 1970. The geology of the Stirling district. Memoir of the Geological Survey of Great Britain, Sheet 39 (Scotland). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S012 S021 S030 S030 S038 S039 S038 S040 S040 S048 S049 S033 S033 S048 S039 S014 S022 S022 S029 S033 S057 S034 S338