The BGS Lexicon of Named Rock Units — Result Details

Burncrooks Volcaniclastic Member

Computer Code: BCV Preferred Map Code: notEntered
Status Code: Full
Age range: Arundian Substage (CJ) — Asbian Substage (CR)
Lithological Description: Volcaniclastic sedimentary rock, some lacustrine, tuff and agglomerate. Pyroclastic rocks include tephra cones which in some places coalesce. Lacustrine sedimentary rocks in the form of mudstone containing fish scales, overlying a discontinuous coal seam, are exposed south of Rigangower [NS 438 757].
Definition of Lower Boundary: The Burncrooks Volcaniclastic Member is underlain by the sedimentary rocks of the Clyde Sandstone Formation.
Definition of Upper Boundary: The Burncrooks Volcaniclastic Member is overlain by the lavas of the Auchineden Lava Member and Saughen Braes Lava Member.
Thickness: 0-80 m, very variable, thins to north-east and south.
Geographical Limits: The Burncrooks Volcaniclastic Member crops out along the north-western and western margins of the Kilpatrick Hills lava block. It stretches from north-east of Bowling [NS 455 739] to Burncrooks Reservoir [NS 482 796] with more isolated patches along the northern margin of the faulted block.
Parent Unit: Clyde Plateau Volcanic Formation (CPV)
Previous Name(s): Burncrooks Pyroclastic Member [Obsolete Name and Code: Use BCV] (-45)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  The Loch Humphrey Borehole penetrates 70 m of the Burncrooks Volcaniclastic Member where it is overlain by the Auchineden Lava Member and underlain by sedimentary rocks of the Clyde Sandstone Formation. In the borehole, the member mainly consists of tuff and lapilli-tuff, with a few thin lavas and sandstone beds. A full geological description of the core is available in BGS borehole records. 
Type Area  The member outcrops around Fyn Loch [NS 460 772] and Lily Loch [NS 473 780] where it is 10-20 m thick and consists mainly of tuff and volcaniclastic sedimentary rocks. Hall et al., 1998. 
Reference(s):
Hall, I H S, Browne, M A E and Forsyth, I H. 1998. Geology of the Glasgow district. Memoir of the British Geological Survey, Sheet 30E (Scotland). 
Dean, M T, Browne, M A E, Waters, C N and Powell, J H. 2011. A lithostratigraphical framework for the Carboniferous successions of northern Great Britain (onshore). British Geological Survey Research Report, RR/10/007. 165pp. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S030