A bullaun stone, the type of roughly worked boulder bearing a deliberate cup-shaped hollow that appears at early medieval and prehistoric sites across Ireland, was recorded here inside the enclosure of a dry-stone cashel. A cashel is a roughly circular stone-walled fort or enclosure, common across the west of Ireland, and this one sheltered a carved stone that had apparently been significant enough to note but not significant enough to map. It never appeared on any edition of the Ordnance Survey six-inch maps, which makes its documented existence feel faintly ghostly.

What we know about the stone comes almost entirely from a single observation made by Milligan in 1890 or 1891, recorded in the relevant volume of what appears to have been an antiquarian survey. Milligan described it as sitting on the eastern side of the cashel interior, comparing it to a font, the kind of stone basin found in churches for holding holy water, which is a reasonable comparison given the form. The stone stood about 0.86 metres high, its upper surface flat and roughly 0.6 metres square. The basin carved into that surface was 0.13 metres deep and 0.28 metres in diameter, a modest hollow but a deliberate one. Bullaun stones are thought to have served ritual or practical purposes, possibly for grinding, possibly for collecting water considered to have curative properties, and their presence within a cashel adds a layer of significance that is now very difficult to read. Today there is no visible surface trace of the stone at all.