Bullauns are stones, usually granite or other hard rock, with one or more deliberate circular depressions ground into their surface. They are found across Ireland, often associated with early ecclesiastical sites, and their original purpose remains genuinely uncertain; theories range from the practical, such as grinding grain or preparing pigments, to the devotional, with many bullauns accumulating folklore around cursing or healing.

This particular stone, a compact granite block measuring 48 centimetres by 52 centimetres, has a single circular bowl roughly 27 centimetres in diameter and up to 10 centimetres deep. It originally belonged to a church site at Castletimon, and at some point after 1990 it was moved to its present position at Brittas Church, where it was set into cement. The surface around the rim of the bowl has been defaced, which makes it difficult to know whether there were once decorative or worn features there, or simply whether time and handling have taken their toll. What is clear is that the stone is no longer where it spent most of its existence, and the cement setting, practical as it may have seemed at the turn of the millennium, means it cannot easily be studied or moved again without damage.