This is a bullaun stone, a type of ancient stone with one or more cup-shaped depressions ground into its surface, found at early Christian and prehistoric sites across Ireland. They were used for grinding, for collecting rainwater regarded as curative, or for ritual purposes that remain only partially understood. This particular example is roughly a metre across and just under a quarter of a metre thick, with a circular hollow nearly forty centimetres wide and twenty-four centimetres deep. The base of that hollow has broken away entirely, leaving a gap large enough to put a hand through, which gives the stone an odd, almost skeletal quality.

The graveyard at Killamery holds the remains of a monastery said, by the early twentieth-century historian Canon Carrigan, to have been founded by St. Gobán Fionn in the early seventh century. Gobán Fionn's feast day falls on the sixth of December. The site is mentioned in the Annals of the Four Masters, which record the death of an abbot, Domhnall son of Niall, in the year 1004. What survives above ground today includes a high cross, two cross-slabs, a stone cross, the shell of a church, and two bullaun stones. This boulder, a free-standing piece, was most likely discovered somewhere within the graveyard and moved to its present position near the high cross. The second bullaun at the site is probably the one Carrigan described as a font, which he placed about 250 yards upslope to the south of the graveyard. The landscape itself is layered in a way that rewards slow attention: the graveyard sits on raised ground, the land drops sharply to a small valley where St. Nicholas's holy well lies roughly ten metres to the south, and then rises again to the church remains, all enclosed within the one boundary.