What the 1945 revision of the Ordnance Survey six-inch map recorded as a hachured feature, the kind of cartographic marking used to suggest a depression or earthwork, was confirmed on inspection in 1984 to be a large, disused quarry, its edges long since softened by gorse and the general indifference of the surrounding landscape.

The quarry at Lissaniska is post-1700 in date, which places it outside the scope of formal archaeological classification in Ireland, a boundary that says less about the site's interest than about how heritage categories are drawn. Quarries of this period were working parts of the rural economy, supplying stone for field walls, roads, and farm buildings, and their closure often left little trace beyond a scar in the ground and a faint mark on old maps. That this one was significant enough to appear on a mid-twentieth-century revision suggests it was once a substantial operation, even if nothing of its working life has been formally recorded. The gorse that now covers it is doing what gorse does across much of the west of Ireland, colonising disturbed or neglected ground with considerable enthusiasm.