Carved into its upper surface is a single oval basin, roughly 45 centimetres long and 10 centimetres deep, worn smooth in the way that only centuries of use and weather can manage. This is a bullaun stone, a type of ancient ritual or functional stone found at early Christian and pre-Christian sites across Ireland, characterised by one or more deliberately hollowed depressions ground into the rock. Their precise original purpose remains debated, though they are frequently associated with early monastic enclosures and are sometimes linked to folk traditions of healing water collecting in the basins.

What makes this particular example quietly interesting is its location. Rather than occupying a prominent or central position within the enclosure, it lies in the fosse itself, the ditch boundary rather than the interior. Whether it was placed there originally or came to rest in that position over time is unclear, but it sits embedded in the landscape of an ecclesiastical site that points to early Christian settlement on the island. The stone measures 0.7 metres by 0.45 metres, modest in scale but unmistakably shaped by human intention.