Tucked into the eastern side of its enclosing fosse lies a bullaun stone, a large boulder or outcrop bearing one or more rounded cup-shaped depressions ground into its surface, most likely through long ritual use. Bullaun stones are common enough in Ireland, but finding one sitting within the ditch of a burial monument is an arresting detail.

A ring barrow is a prehistoric funerary monument, typically a low circular mound or flat central area enclosed by a ditch, known as a fosse, and an outer bank. Here the fosse is relatively shallow, just 0.15 metres deep, with the internal face of the surrounding bank rising 0.6 metres and the external face a somewhat lower 0.38 metres. These are quiet, unassuming measurements, the kind that make it easy to walk past such a monument without registering what it is. The association of the bullaun stone with the site raises questions that are genuinely difficult to answer. Bullaun stones are generally thought to have been used in early medieval religious or folk practice, which would make this one considerably later than the barrow itself, yet here the two elements share the same ground. Whether the stone was already present when the barrow was constructed, or was placed in the fosse at some later point by people who recognised the site as somewhere significant, is not recorded. What it suggests, at minimum, is that this particular patch of hillside held meaning across more than one period of human activity.