The BGS Lexicon of Named Rock Units — Result Details

Loup of Fintry Lava Member

Computer Code: LFLA Preferred Map Code: notEntered
Status Code: Full
Age range: Arundian Substage (CJ) — Asbian Substage (CR)
Lithological Description: The Loup of Fintry Lava Member consists of two lavas, separated by a thin bed of basaltic lapilli-tuff, with a combined thickness of nearly 30 m in the vicinity of Loup of Fintry [NS 662 862]. The lower lava is a plagiogclase-macrophyric trachybasalt (of 'Markle' type). The upper lava is a composite flow of similar overall composition, with intermingling of aphyric and feldspar-phyric components [NS 656 858].
Definition of Lower Boundary: The lower (basal) plagioclase-macrophyric trachybasalt lava is conformable or disconformable on the underlying plagioclase-microphyric trachybasalt of the lower north Campsie lavas (Campsie Lava Member).
Definition of Upper Boundary: The upper composite lava of the Loup of Fintry Lava Member is overlain apparently conformably, or disconformably by the upper north Campsie lavas (Campsie Lava Member). The lithological change is mostly to plagioclase-microphyric basalt (of 'Jedburgh' type), trachybasalt and basaltic-trachyandesite (mugearite).
Thickness: 30 m
Geographical Limits: The member is restricted to the Campsie Block and specifically to the north-eastern Campsie Fells, north-east of Glasgow. These rocks crop out in small isolated areas: in the vicinity of the Loup of Fintry [NS 662 862]; at the north-west end of Loch Carron [NS 673 856]; and near the Spout of Dalbowie [NS 641 869].
Parent Unit: Clyde Plateau Volcanic Formation (CPV)
Previous Name(s): Loup of Fintry Lavas (-4158)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Loup of Fintry (waterfall), in the Endrick Water, north-eastern Campsie Fells, north-east of Glasgow Craig, 1980 
Type Area  The north-eastern Campsie Fells, north-east of Glasgow Forsyth et al, 1996, after Craig, 1980 
Reference(s):
Forsyth, I H, Hall, I H S and McMillan, A A. 1996. Geology of the Aidrie district. Memoir of the British Geological Survey, Sheet 31W (Scotland). 
Craig, P.M. 1980 The Volcanic Geology of the Campsie Fells area, Stirlingshire. Unpublished PhD thesis, University of Lancaster. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S031