This is a bullaun stone, a type of ancient carved rock found at early Christian and sometimes pre-Christian sites across Ireland, characterised by one or more cup-shaped depressions ground into the rock face. The basin here is modest in size, roughly 33 centimetres across and 16 centimetres deep, but its precision distinguishes it from the kind of hollow that water or weathering alone might produce over centuries.

The boulder, measuring approximately 1.70 metres by 1.50 metres, lies immediately to the west of a recorded church site, which is precisely the kind of association these stones tend to have. Bullauns appear frequently in the vicinity of early ecclesiastical enclosures, holy wells, and monastic remains, and while their exact function remains debated, they are generally thought to have served ritual or liturgical purposes, possibly for grinding pigments or preparing materials used in religious practice, or as focal points for devotional activity. The water that now surrounds this particular stone adds a further layer of ambiguity; it is unclear whether the stream has shifted over time to engulf the boulder, or whether proximity to water was always part of its setting.