On the 1933 edition of the Ordnance Survey six-inch map, the feature appeared as a hachured marking, the kind of hatched symbol cartographers used to indicate a depression or earthwork of uncertain character. It looked, in other words, like something worth investigating.

When someone finally did investigate, in 1983, the mystery resolved itself quietly. The feature was a quarry pit, almost certainly dug after 1700, which placed it outside the scope of formal archaeological classification. That cutoff date matters in Irish heritage recording: the Archaeological Survey of Ireland concerns itself with monuments from earlier periods, so a post-medieval working pit, however visually suggestive on a Victorian-era map, falls into a gap between disciplines. For fifty years, a practical scar in the bog had been carrying the ambiguous weight of a cartographic symbol that implied something older.