The BGS Lexicon of Named Rock Units — Result Details

Moyne Moor Lava Member

Computer Code: MMLA Preferred Map Code: notEntered
Status Code: Full
Age range: Visean Stage (CV) — Visean Stage (CV)
Lithological Description: The Moyne Moor Lava Member consists of plagioclase porphyritic trachybasalts (hawaiites) with discrete subordinate alkali basalt and rare basaltic trachyandesites (mugearites) near the top of the Member. These might herald the initiation of trachytic magma generating the trachytes of the overlying Harelaw Lava Member.
Definition of Lower Boundary: The base is possibly unconformable on the sedimentary strata of the Ballagan Formation (Inverclyde Group), but the contact is not seen because of faulting.
Definition of Upper Boundary: The Member is overlain by the geographically separate (and laterally equivalent) alkali basalts of the Eaglesham and Neilston Lava members. The contacts are considered conformable but also locally unconformable.
Thickness: >100m
Geographical Limits: Dunlop-Eaglesham moors between Glasgow, Kilmarnock and Hamilton, irregular shaped but continuous outcrop from Balgray Reservoir (NS 510 570) to Over Auchentibber Farm (NS 459 498).
Parent Unit: Clyde Plateau Volcanic Formation (CPV)
Previous Name(s): Moyne Moor Lavas (-2325)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Dunlop-Eaglesham moors between Glasgow, Kilmarnock and Hamilton, irregular shaped but continuous outcrop from Balgray Reservoir (NS 510 570) to Over Auchetibber Farm (NS 459 498). MacPherson and Phillips. 1997. 
Reference(s):
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). 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S022