But the slab at Gortdromagh carries eight cupmarks, those shallow circular depressions pecked into rock whose precise purpose has never been satisfactorily explained, and which appear across prehistoric Europe in contexts ranging from burial monuments to open hillsides. What makes this particular stone quietly odd is not just the cupmarks themselves but what the stone appears to be: most likely a displaced lintel, a covering slab that once lay across the entrance or roof of the souterrain beside which it now rests.

A souterrain is a man-made underground chamber or passage, typically built during the early medieval period in Ireland and often associated with the ringforts, or raths, that were the standard enclosed farmsteads of that era. The ringfort at Gortdromagh is univallate, meaning it has a single enclosing earthen bank rather than the double or triple rings found at more elaborate sites. The stone measures 1.3 metres in length and 0.85 metres in width, substantial enough to have served a structural role. If it was indeed a lintel before it was displaced, then someone, at some point, either repurposed a much older cupmarked stone for a practical building task, or the cupmarks were added to a stone already in use. Either way, the object sits at an intersection of two quite different periods of activity, the prehistoric tradition of marking stone with cups and the early medieval practice of constructing souterrains within enclosed settlements.