The basin, roughly thirty centimetres across and cut into a surface that slopes steeply rather than lying flat, is the kind of detail that rewards a second look. This is a bullaun stone, a class of early medieval monument found widely across Ireland, typically associated with ecclesiastical sites or sacred landscapes. The term refers to a natural or roughly shaped boulder into which one or more cup-shaped depressions have been carefully worked, most likely by sustained grinding or pecking. The purpose of these basins has long been debated; collected rainwater in bullauns was sometimes regarded as having healing or protective properties, and small rounded stones placed within them were occasionally used in cursing or blessing rituals that persisted well into the post-medieval period.

The boulder itself is substantial, measuring approximately 1.45 metres by 1.26 metres, and sits earthfast, meaning it is set firmly into the ground rather than resting loose on the surface. That distinction matters: an earthfast stone is far harder to move or repurpose, which may partly explain why so many bullauns have survived in situ across centuries of agricultural change and land clearance. The place name Knockatemple, combining the Irish cnoc, meaning hill, with the word for church, hints at the kind of early ecclesiastical setting in which these stones are most commonly found, though no further detail about associated structures at this particular location appears in the available record.