What makes it worth pausing over are three small depressions ground into its flat, crystal-covered surface: cupmarks, the modest but persistent signature of prehistoric human attention. Cupmarks are shallow, roughly circular hollows, pecked or ground into rock by hand, and they appear across Ireland and Britain from the Neolithic period onward. Nobody has fully agreed on what they meant to the people who made them, which is part of what makes finding one unexpectedly, in a plantation on a Clare hillside, feel quietly unsettling.

The boulder itself is an erratic, meaning it was deposited here by glacial movement rather than formed in place, and it sits low to the ground, almost square in plan, measuring roughly 1.21 metres north to south and 1.15 metres east to west. Its top surface slopes gently southward and is covered in small quartz crystals, with a smoother sandstone seam running along the eastern edge. The three cupmarks are arranged in a loose cluster: two sit close together near the centre, the better-formed of the pair measuring around two and a half centimetres across with a clean, smooth profile, while its slightly rougher neighbour sits just two centimetres to the north. A third, shallower and wider example lies about nineteen centimetres to the northwest. There are also two hollows elsewhere on the stone that may simply be natural. The site commands a broad outlook across Lackareagh Mountain, the Ardclooney River valley, and southeast toward the Shannon. It was brought to the attention of the National Monuments Service by Mark Brennan, and without that kind of observant local reporting, it would almost certainly have remained unrecorded.