http://earthwise-staging.bgs.ac.uk/index.php?action=history&feed=atom&title=Cochno_Lava_MemberCochno Lava Member - Revision history2026-04-17T12:01:42ZRevision history for this page on the wikiMediaWiki 1.42.3http://earthwise-staging.bgs.ac.uk/index.php?title=Cochno_Lava_Member&diff=52521&oldid=prevDbk: 1 revision imported2021-07-26T14:53:49Z<p>1 revision imported</p>
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<p><b>New page</b></p><div>== Cochno Lava Member [http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=CCLA (CCLA)], Kilpatrick Hills, Carboniferous, Midland Valley of Scotland ==<br />
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The Conch Lava Member is part of the [[Clyde Plateau Volcanic Formation]].<br />
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=== Name ===<br />
Previously named the Cochno Lavas (Hall et al., 1998)<ref name="hall98">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)</ref>.<br />
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=== Lithology ===<br />
The Cochno Lava Member includes a wide range of lava types but is characterised by mafic varieties, particularly near the base. These include olivine-microphyric basalts (‘Dalmeny’ type), olivine-clinopyroxene-macrophyric basalts (‘Craiglockhart’ type) and olivine-clinopyroxene-plagioclase-macrophyric basalts (‘Dunsapie’ type). Localised plagioclase-macrophyric basalts (‘Markle’ type) and plagioclase-microphyric basalts (‘Jedburgh’ type) occur around Bowling (NS 445 738).<br />
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=== Stratotype ===<br />
The Cochno Lava Member crops out in its type area between Cochno Loch (NS 500 760) and Craigton (NS 520 770).<br />
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=== Lower and upper boundaries ===<br />
The Cochno Lava Member overlies the [[Greenside Volcaniclastic Member]] and represents the recommencement of lava extrusion after a major break in activity. It is overlain by the [[Mugdock Lava Member]].<br />
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=== Thickness ===<br />
Between 100 and 250 m thick in the Kilpatrick Hills region. The member thins towards the north-east of the region, but is thicker adjacent to the Campsie Fault (Hall et al., 1998<ref name="hall98"/>, table 5).<br />
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=== Distribution and regional correlation ===<br />
The Cochno Lava Member stretches north-east from Bowling (NS 450 738) in the south-west of the Kilpatrick Hills to the south of Clachan of Campsie (NN 610 790) where the lavas are correlated with the [[Knowehead Lava Member]] of the Western Campsie Fells area. Associated vents are located at Burnside (NS 474 741), Black Loch (NS 500 765), and Craigton (NS 525 770).<br />
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=== Age ===<br />
Mid Visean (Arundian to Asbian).<br />
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== References ==<br />
<references/><br />
[[Category:Carboniferous lithostratigraphical nomenclature]]</div>Geosource>Volunteer 01