For decades it existed in cartographic form as a hachured feature, the small hatched symbol that Ordnance Survey draughtsmen used to indicate a slope or depression, suggesting something worth noting but leaving the nature of it unresolved.

The 1945 revision of the OS six-inch map was the source of that mark, and it was not until 1984 that someone went out to look properly. The inspection confirmed a quarry, cut into the side of the hummock, and almost certainly worked at some point after 1700. That post-medieval date places it outside the scope of formal archaeological classification, which in Ireland generally concerns itself with sites predating that threshold. In practical terms, this means the quarry occupies an odd administrative gap: physical enough to appear on a mid-twentieth-century map, old enough to have become part of the landscape, but too recent to attract the attention that older earthworks receive.