That, in itself, is the point. A megalithic structure once stood at this location, the kind of prehistoric monument that might have taken the form of a portal tomb, a standing stone, or a chambered cairn, built thousands of years ago and part of the landscape long enough to be remembered by the people who farmed around it. Then, sometime in the 1980s, it was removed during land reclamation works, and the ground was smoothed over. No visible trace remains at surface level.

The loss was recorded through local information rather than any prior formal excavation or documentation, which means the precise nature of the structure is unknown. What type of megalith it was, how large, how old, whether it bore any markings or contained any deposits, none of that was captured before it disappeared. Land reclamation during that period involved significant earthmoving across many parts of the west of Ireland, as marginal and boggy ground was drained and turned to pasture. Prehistoric monuments, which had often survived for millennia precisely because the surrounding land was too wet or difficult to farm, were in some cases cleared away in the process. This site in Grallagh is one of those losses, known now only because someone remembered it was there.