The BGS Lexicon of Named Rock Units — Result Details

Mugdock Lava Member

Computer Code: MGLA Preferred Map Code: notEntered
Status Code: Full
Age range: Arundian Substage (CJ) — Asbian Substage (CR)
Lithological Description: Predominantly plagioclase-macrophyric basalts (Markle type). Near Devil's Craig Dam [NS 560 782] a few lavas have abundant feldspar phenocrysts of about 5mm and some up to 2cm in length. Near Craigend Castle [NS 548 777] a thin olivine-clinopyroxene-macrophyric basalt (Craiglockhart type) occurs and in the western part of the Kilpatrick Hills, mugearite lavas are present.
Definition of Lower Boundary: The Mugdock Lava Member overlies the more-mafic olivine-microphyric basalts (Dalmeny type), olivine-clinopyroxene-plagioclase-macrophyric basalts (Dunsapie type) and olivine-clinopyroxene-macrophyric basalts (Craiglockhart type) of the underlying Cochno Lava Member.
Definition of Upper Boundary: The Mugdock Lava Member is overlain by the olivine-microphyric basalts (Dalmeny type) of the Tambowie Lava Member in the south of the Kilpatrick Hills. To the north, the Tambowie Lava Member is absent and the Mugdock Lava Member is directly overlain by the sedimentary rocks of the Lawmuir Formation.
Thickness: 100-200m
Geographical Limits: The Mugdock Lava Member is present in the south of the Kilpatrick Hills, between Old Kilpatrick [NS 465 730], where it is continuous with the upper part of the Strathgryfe Lava Member of the Renfrewshire Hills lava block south of the River Clyde, and the area around Mugdock [NS 56 77].
Parent Unit: Clyde Plateau Volcanic Formation (CPV)
Previous Name(s): Mugdock Lavas (Hall Et Al. 1998) (-1693)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  The Mugdock Lava Member is well exposed between Mugdock Loch [NS 554 773] and Deil's Craig Dam [NS 560 782]. 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). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S030