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Published online by Cambridge University Press: 01 May 2009
During an investigation of the rocks of North-West Carnarvonshire older than the Llanberis Slates, the detailed results of which I hope soon to publish, I have discovered certain exposures of quartz-felsite which are not marked as such on the maps of the Geological Ordnance Survey, nor have been described, as far as I know, by other observers.
1 This is probably the locality just referred to by Blake, J. H., Q.J.G.S., xlix, p. 463.Google Scholar