That detail alone marks this out as something worth pausing over. The stone is a bullaun, a type of ancient carved or worn rock featuring one or more cup-shaped depressions whose original purpose remains debated, with theories ranging from grinding and processing to ritual use. This particular example is modest in scale, measuring just 32 centimetres long and 24 centimetres wide, with a near-circular basin roughly 11 by 12 centimetres. The coins pressed into that hollow are not the work of tourists; they indicate ongoing devotion, placed there by people for whom the spot retains genuine significance.

The site has a layered history. According to a local account published by Glynn in 1908, this was a place where Mass was celebrated during the Penal Laws, the series of statutes that, from the late seventeenth century, severely restricted Catholic worship in Ireland. During that period, outdoor locations, sometimes marked by a flat stone used as an improvised altar, became sites of clandestine religious gathering. The bullaun here rests on just such an altar, which survives as a separate recorded monument. That combination, an ancient carved stone lying atop a Mass rock, suggests the site accumulated meaning across different periods, the pre-Christian object absorbed into a later devotional landscape and then pressed into service again when formal church buildings were too dangerous to use.

The coins in the basin, and the note that the monument appears to be still regarded as a place of worship, suggest this is not purely an archaeological curiosity. Whatever continuity of use has kept the site alive into the present, it has outlasted both the penal era and the scholarly categories used to describe it.