That ambiguity is itself what makes them worth knowing about. In a landscape saturated with Neolithic and Bronze Age remains, not everything ancient is necessarily man-made, and these two stones sit awkwardly on the boundary between human intention and geological accident.

The larger and more southerly of the two stones, classified as National Monument No. 247, measures 1.4 metres in height and 2.1 metres in length, tilting at an angle of 60 degrees into the hillside. Writing in 1912, Bertram Windle noted something immediately curious: every natural outcrop on Killalough Hill is limestone, yet both stones are conglomerate, a different rock type entirely. To Windle, this strongly suggested the stones had been brought to the site deliberately, and he described them as galláns, the Irish term for a standing stone set upright into the ground as a prehistoric marker. He recorded their precise compass bearings and noted they had no name on the Ordnance Survey map, sitting unmarked above the nearby megalithic tombs known locally as the Giants' Graves. A companion stone stands roughly 50 metres to the north-north-west. By 1944, however, M. J. O'Kelly was less convinced, arguing that the two low boulders looked far more like glacial erratics, stones transported and deposited naturally by ice sheets, than deliberate prehistoric monuments.

The site sits on top of Killalough Hill, with the eastern shoreline of Lough Gur approximately 280 metres to the west-north-west. The stones are visible on aerial photography, which gives some sense of their position relative to the ridge line. Visitors to the wider Lough Gur area, which contains one of Ireland's densest concentrations of prehistoric remains, can approach the hill on foot; the surrounding landscape rewards careful attention to the ground underfoot, where the contrast between limestone bedrock and the conglomerate of these two particular stones is a tangible detail that kept Windle's argument alive for decades.