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Columnar sandstone, Island of Bute, Scotland
Published online by Cambridge University Press: 01 May 2009
Summary
A unique columnar sandstone, produced by the thermal metamorphism of an Upper Old Red quartz arenite, is described, from South Bute, together with other examples of similarly altered sediments from nature and industry. The columnar structure probably developed as a result of the emplacement of a basic dyke via a fissure. In view of the relatively large area exhibiting this structure, metamorphic effects must have been amplified by the agency of steam and volatile constituents of the magma, passing up through the fissure.
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