The BGS Lexicon of Named Rock Units — Result Details

Stronend Volcaniclastic Member

Computer Code: STRV Preferred Map Code: notEntered
Status Code: Full
Age range: Arundian Substage (CJ) — Asbian Substage (CR)
Lithological Description: The Stronend Volcaniclastic Member consists predominantly of volcaniclastic sedimentary rocks and possible tuff, with weathered basalt lava (including 'bole') and the member weathers back to form a prominent shelf in the escarpment on the western side of the Fintry Hills.
Definition of Lower Boundary: Weathered basalt ('bole') at the base of the member is conformable or disconformable on plagioclase-microphyric basalt lava of the Spout of Ballochleam Lava Member, within which the Stronend Volcaniclastic Member is interdigitated.
Definition of Upper Boundary: Volcaniclastic rocks of the Stronend Volcaniclastic Member are overlain by plagioclase-microphyric basalt lava of the Spout of Ballochleam Lava Member, within which the Stronend Volcaniclastic Member is interdigitated
Thickness: Uncertain
Geographical Limits: The member is restricted to the western Fintry Hills, north-east of Glasgow. These rocks crop out out in a restricted area from the western side of Stronend [NS 6274 8953] to the south-south-east, to north of Double Craig [NS 6322 8808].
Parent Unit: Clyde Plateau Volcanic Formation (CPV)
Previous Name(s): Stronend Interbasaltic Beds (-548)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  0.5 km south of Stronend summit, western Fintry Hills, north-east of Glasgow Francis et al, 1970 
Type Area  In the western Fintry Hills, north-east of Glasgow Francis et al, 1970 
Reference(s):
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:
S039