The BGS Lexicon of Named Rock Units — Result Details

Shelloch Burn Lava Member

Computer Code: SHEB Preferred Map Code: notEntered
Status Code: Full
Age range: Arundian Substage (CJ) — Asbian Substage (CR)
Lithological Description: The Shelloch Burn Lava Member consists of a varied assemblage of lavas including: trachybasalt, basaltic trachyandesite (mugearite), microporphyritic basalt (of Jedburgh' type); plagioclase-macrophyric basalt (of 'Markle' type); and transitional plagioclase-microphyric to plagioclase-macrophyric basalts. The lavas are variably massive to locally platy jointed, slaggy and vesicular, dull red 'boles' are common and a lava tube has been observed.
Definition of Lower Boundary: The basal trachbasalt lava of the member is conformable or disconformable on the underlying plagioclase-microphyric basalts of the Spout of Ballochleam Lava Member.
Definition of Upper Boundary: The member is overlain unconformably by the Fintry Hills Lava Member. The lithological change is from basaltic trachyandesite (mugearite) or trachybasalt to plagioclase-microphyric basalt.
Thickness: 40-61m
Geographical Limits: The member is restricted to the Fintry Hills, north-east of Glasgow. These rocks crop out from around Stronend [NS 6290 8946] in the north-west of the Fintry Hills towards the east, in the Boquhan Burn and its headwaters ([NS 6388 8988] to [NS 6490 8965]) and the Shalloch Burn ([NS 6513 8920] to [NS 6541 8939]), and south-east to the Balmenoch Burn ([NS 6465 8771] to [NS 6464 8753]) and beyond, although the limits of the member to the south-east are uncertain.
Parent Unit: Clyde Plateau Volcanic Formation (CPV)
Previous Name(s): Shelloch Burn Group (-3672)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  In the Fintry Hills, north-east of Glasgow Francis et al, 1970 
Reference Section  Crags forming the western edge of the 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