On the 1944 to 1945 revision of the Ordnance Survey six-inch map, the feature was marked with hachures, the short radiating lines that surveyors traditionally used to indicate a slope or earthwork of some kind. Without further context, such a mark could suggest almost anything: a ringfort, a collapsed bank, a field boundary of some antiquity. When the site was inspected in 1984, the answer turned out to be considerably more mundane, though no less interesting for that. It was a quarry, long since abandoned.

Because the quarry dates to after AD 1700, it falls outside the scope of formal archaeological classification in Ireland, which generally concerns itself with earlier remains. That boundary is a useful reminder of how recently the landscape was still being actively cut and shaped for building stone or lime production. Whoever worked this particular hollow on the hummock in Feaghbeg left no record beyond the scar itself and the surveyor's mark that quietly preserved its outline on a mid-twentieth-century map.