Hachures, the short radiating lines used by cartographers to suggest slopes or depressions in the landscape, can indicate anything from a ringfort to a natural hollow, and their presence on a historical map is often enough to send a surveyor out to investigate. When someone did just that in 1982, the feature turned out to be a quarry pit, almost certainly dug after 1700 to extract stone or gravel for local use, the kind of working that once existed in some form on nearly every substantial landholding in rural Ireland.

The finding placed the site firmly outside the scope of archaeological protection, which in Ireland generally concerns itself with remains predating AD 1700. That boundary is not arbitrary; it reflects the point at which documentary records become sufficiently dense that built and industrial features can be studied through archives rather than excavation alone. A post-1700 quarry pit is, in that sense, recent history rather than archaeology, even if the labour and the lives connected to it have left no written trace at all. What the Rahasane pit was quarried for, who owned the land at the time, and how long it remained in use are details the map alone cannot supply.