Printed from: https://conservationhandbooks.com/dry-stone-walling/variations-in-walling/galloway-dykes/
The Galloway or half-dyke probably developed as the best way to use supplies of stone that were mainly large and medium size, with little hearting. The large stones used in the upper single part would make a very wide wall if used double. It is an efficient walling style, using less stone at any given...