Hachuring, the use of short radiating lines to indicate a depression or slope in the terrain, was the cartographer's way of flagging something worth noting, though not always explaining what. When the site was inspected in 1984, that unremarkable mark on ageing paper turned out to correspond to a disused quarry, its footprint a large irregular pit cut into the ground and long since abandoned.

The quarry is thought to date from the nineteenth or early twentieth century, a period when local stone extraction was commonplace across rural Ireland, supplying material for field walls, roads, and buildings in the surrounding townlands. Quarries of this kind were rarely grand operations; many were opened to serve a single construction project or a farm's immediate needs, then left once the work was done. Over decades, such pits tend to soften at the edges, fill with water or scrub, and gradually lose their industrial character until they read more as landscape than as human intervention. The Ballyroe example fits this pattern, its irregular outline suggesting opportunistic extraction rather than any systematic working of the stone.