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The Galloway dyke is a distinctive type of drystone walling common throughout southwest Scotland. Also known as a half-single dyke, the lower half is of double dyke construction (two stone walls built parallel to each other, held together with through stones and with the core infilled with smaller stones) and the upper of single. Galloway dykes feature a cover band half way up the build where the section of double dyke ends and the single dyke begins. (http://conservation.historic-scotland.gov.uk/inform-dry-stone-walls.pdf )