The Ordnance Survey six-inch map from 1930 marks the area with hachures, the cartographic shorthand used to indicate disturbed or irregular terrain, but whether that marking described a quarry, a collapsed feature, or something else entirely was not confirmed until 1984, when an inspection revealed the site to be a substantial disused quarry, by then well colonised by gorse and scrubby bushes.

The gap between the mapping and the inspection, more than fifty years, is itself quietly telling. Working quarries like this one would have supplied stone for local construction, field walls, roads, or building work, and when the demand passed or the usable stone ran out, such sites were simply left. Without ongoing use to keep the vegetation back, gorse in particular moves in fast and thoroughly, softening the cut edges of the rock until the industrial character of the place becomes almost invisible. What the 1984 visit confirmed was that the hachured patch on the old map was not an error or an ambiguity, but a real and considerable excavation that the landscape had quietly absorbed.