Fintry Hills Lava Member
Fintry Hills Lava Member (FHLA), Fintry-Touch Block, Carboniferous, Midland Valley of Scotland
Fintry Hills Lava Member is part of the Clyde Plateau Volcanic Formation.
Previously named the Fintry Hills Group (see Francis et al., 1970).
The Fintry Hills Lava Member consists predominantly of plagioclase-macrophyric basalt lavas (‘Markle’ type) with a fairly high proportion of microporphyritic basalts and rare basaltic-trachyandesite (mugearite). Tuff occurs locally at (NS 6409 8794).
The type area is in the highest parts of the Fintry Hills, north-east of Glasgow (NS 6369 8867 to NS 6321 8911) (Francis et al., 1970).
Lower and upper boundaries
The basal basalt of the member lies apparently conformably or disconformably on trachybasalt of the Shelloch Burn Lava Member. The upper boundary is eroded but not exposed.
More than 122 m. The top of the member is eroded.
Distribution and regional correlation
The member is restricted to the Fintry–Touch Block (Francis et al., 1970) and specifically to the Fintry Hills, north-east of Glasgow. These rocks crop out across the hilltops of the central part of the Fintry Hills (NS 6369 8867 to NS 6321 8911).
Mid Visean (Arundian to Asbian).
- 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)