This is a bullaun stone, a type of ancient rock with one or more smooth basins ground into it, found widely across Ireland and often associated with early Christian or pre-Christian sacred activity. The water that collects in these basins was commonly believed to have curative or protective properties, and many bullaun stones remain the focus of local devotion long after any formal religious context has been forgotten.

The Delgany example is a substantial piece of granite, roughly 1.2 metres wide and 0.9 metres high. Its principal basin, measuring 38 centimetres across and 34 centimetres deep, has at some point been fractured, leaving approximately two thirds of it intact. Beside it sits a smaller cup-shaped depression, only 12 centimetres in diameter and 5 centimetres deep, of the kind sometimes interpreted as a secondary ritual feature or simply as an earlier, unfinished attempt at a similar hollow. When the stone was formally inspected in 2003, dense vegetation had largely obscured it, which may say something about how thoroughly it had slipped from active use or local awareness by that point.