In hilly pastureland near Liss in County Galway, an indentation in the landscape caught the attention of cartographers working on the 1920 edition of the Ordnance Survey six-inch map, where it was marked using hachures, the fine radiating lines surveyors used to indicate a depression or raised feature in the terrain.

When the site was physically inspected in 1983, the feature turned out to be a quarry pit, almost certainly used for extracting stone or perhaps gravel for local building or road maintenance, activities that became increasingly common across rural Ireland from the eighteenth century onwards. Because it dates to after AD 1700, it falls outside the scope of formal archaeological classification, which tends to concern itself with earlier periods. That boundary is not arbitrary; it reflects a genuine disciplinary limit, though it does mean that the working landscapes of comparatively recent centuries can slip through the documentary record in ways that older ringforts or burial mounds do not. A quarry serving a landlord's estate, a road-mending crew, or a farming family leaves little behind except the pit itself.