The BGS Lexicon of Named Rock Units — Result Details

Touch House Lava Member

Computer Code: THLA Preferred Map Code: notEntered
Status Code: Full
Age range: Arundian Substage (CJ) — Asbian Substage (CR)
Lithological Description: The Touch House Lava Member consists only of plagioclase-macrophyric basalt or trachybasalt lavas (basalt to hawaiite of 'Markle' type) and only the lowest part of the member is well exposed, near the edge of the low-lying fertile land between Touch Home Farm [NS 7518 9331] and Touch House [NS 7535 9276].
Definition of Lower Boundary: The basal plagioclase-macrophyric basalt lava of the member is apparently conformable, or disconformable, on the underlying plagioclase-microphyric basalt of the Black Mount Lava Member.
Definition of Upper Boundary: The top of the member is not exposed.
Thickness: Uncertain
Geographical Limits: The member is restricted to a small area in the eastern Touch Hills, north-east of Glasgow. These rocks crop out in an outlier which extends northward from Touch House [NS 7535 9276] to near Touch Home Farm [NS 7524 9340] and westwards to north of Mill Linn [NS 9495 9302].
Parent Unit: Clyde Plateau Volcanic Formation (CPV)
Previous Name(s): Touch House Group (-4923)
Alternative Name(s): none recorded or not applicable
Type Area  In the eastern Touch Hills, north-east of Glasgow Francis et al, 1970 
Reference Section  Exposures between Touch Saw Mill and Touch House, eastern Touch Hills, north-east of Glasgow Francis et al, 1970 
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: