This Carboniferous basanitic vent on the NW Ayrshire coast, 2 km SSW of Fairlie, outcrops on a flat, tidal beach and contains an inclusion assemblage of single-phase megacrysts and altered ultramafic xenoliths. Megacrysts of clinopyroxene, kaersutite, phlogopite and anorthoclase belong to the Al-augite group; the ultramafic xenoliths are identified as amphibole-lherzolites of the Cr-diopside group. Probe analyses of minerals from each group show them to be very similar to other Scottish and world-wide examples of inclusions in undersaturated alkaline volcanic rocks. -R.A.H.
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