On the 1926 revision of the Ordnance Survey six-inch map, the site appears as a hachured feature, the short radiating lines that mapmakers used to indicate a depression or earthwork in the terrain. It took a physical inspection in 1984 to confirm what that marking actually represented: not an earthwork of ancient origin, but the remnant of a quarry, most likely worked during the nineteenth or early twentieth century.

The quarry is modest by any measure, defined now by little more than its hollow, the ground having settled and the woodland grown around it. A second, similar hollow lies to the east, suggesting that small-scale extraction was not an isolated activity in this part of Aghrane. Quarries of this type, cut to supply local building material such as stone for field walls, farm buildings, or road repair, were common across rural Ireland during the nineteenth century and rarely left substantial traces. What is slightly unusual here is the paper trail: the 1926 map revision recorded something worth noting, even if its precise nature remained unclear for another six decades.