This is a bullaun stone, a type of glacial or worked boulder bearing one or more cup-shaped depressions that appear widely across early Christian Ireland, often near ecclesiastical sites. Their exact purpose remains debated; they have been associated with grinding, with ritual use of water, and with the performance of cursing or blessing rites, the collected rainwater in the basins considered potent in some folk traditions.

The stone, measuring approximately 1.25 metres long and a metre wide, lies around fifty metres to the south-west of St. Brecan's Church, a proximity that is unlikely to be coincidental. What makes this particular example notable is the precision of its two basins. Despite the irregular outline of the boulder itself, both hollows are described as regularly cut and even in outline, suggesting deliberate and considered craftsmanship rather than incidental wear. The northern basin is the smaller of the two, roughly 35 centimetres in diameter and 17 centimetres deep, while the southern one is noticeably larger, at 45 centimetres across and 35 centimetres deep. The site was recorded by Kinahan as early as 1868, placing it among the longer-documented early medieval features in the area.