On the 1933 edition of the Ordnance Survey six-inch map, the spot appears as a hachured feature, the kind of hatched, shadow-like marking cartographers used to suggest a depression or earthwork of some kind. It looked significant enough to record, ambiguous enough to leave open to interpretation.

When someone finally walked out to inspect it in 1983, the mystery resolved itself quickly and without drama. The feature was a disused quarry, cut into the bog at some point after 1700. That date matters in a particular bureaucratic sense: because the site is post-medieval, it falls outside the scope of the bodies charged with cataloguing Ireland's ancient monuments, and so it occupies a quiet administrative limbo, noted but not formally studied. What the quarry supplied, who worked it, or when it fell out of use are questions the available record does not answer. Bog quarrying in this period typically yielded stone for local building, drainage works, or road construction, but those are general possibilities rather than confirmed facts about this particular hollow in the ground.