It appears on the 1920 edition of the Ordnance Survey six-inch map as a hachured feature, the short radiating lines cartographers used to suggest a hollow or raised earthwork, the kind of mark that, in an Irish context, can hint at anything from a ringfort to a souterrain. When someone went out to look at it in 1983, the reality was considerably more modest: a sand pit, dug at some point after 1700, of no particular antiquity.