The BGS Lexicon of Named Rock Units — Result Details

Harelaw Lava Member

Computer Code: HWLA Preferred Map Code: notEntered
Status Code: Full
Age range: Visean Stage (CV) — Visean Stage (CV)
Lithological Description: The Harelaw Lava Member consists of trachytes, trachyandesites and trachybasalt lavas.
Definition of Lower Boundary: The base is unconformable on the Moyne Moor and Neilston Lava members, which consist of basaltic lavas.
Definition of Upper Boundary: The Member is overlain by the upper Flow Moss Lava Member. The contact is considered unconformable and locally even intrusive. The trachytic lava flows are thought to have had significant dome-like topographical expression immediately after eruption.
Thickness: >70m
Geographical Limits: Dunlop-Eaglesham moors between Glasgow, Kilmarnock and Hamilton, discontinuous across an area around Halker (NS 410 500), Neilston (NS 520 580), Glenouther Rig (NS 480 480) and Blackwood Hill (NS 550 470).
Parent Unit: Clyde Plateau Volcanic Formation (CPV)
Previous Name(s): Harelaw Lavas (-2253)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Dunlop-Eaglesham moors between Glasgow, Kilmarnock and Hamilton, discontinuous across an area around Halker (NS 410 500), Neilston (NS 520 580), Glenouther Rig (NS 480 480) and Blackwood Hill (NS 550 470). MacPherson and Phillips. 1997. 
Reference(s):
MacPherson, K A T and Phillips, E R. 1997. The geology of the Clyde Plateau Volcanic Formation of the Kilmarnock district (Sheet 22E), central Scotland. British Geological Survey Report, WA/97/88. 
Phillips, E R and MacPherson, K A T. 1996. Petrology, geochemistry and classification of the Clyde Plateau Volcanic Formation, Kilmarnock district (Sheet 22), Midland Valley, Scotland. British Geological Survey Minerology and Petrology Technical Report, WG/96/24. 
MacPherson, K A T, Smith, R A and Akhurst, M C. 2000. Geology of the Kilmarnock district. Sheet description of the British Geological Survey 1:50 000 Sheet 22E Kilmarnock (Scotland). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S022