On the 1945 revision of the Ordnance Survey six-inch map, it appeared as a hachured feature, the cartographic shorthand of small radiating lines used to suggest a depression or earthwork, the kind of mark that can quietly accumulate speculation over time. When someone finally went out to look at it properly, in 1984, the answer turned out to be straightforward: a disused quarry, long since abandoned and returned to rough pasture.