The stone is modest by any measure, roughly circular at its base and no more than twenty centimetres tall, rising to a low rounded peak that gives it a vaguely pyramidal shape. On its western face there is a cupmark, a small circular hollow about three centimetres across and a centimetre deep, of the kind found on prehistoric rock art across Ireland and Britain. Cupmarks are among the oldest surviving examples of human mark-making, typically associated with the Bronze Age, though their precise meaning remains unknown. What makes this one quietly interesting is a question that has not been resolved: nobody is entirely certain whether the hollow was made by human hands at all.

The boulder rests on the flat top of a barrow, a type of earthen or stone burial mound raised during the prehistoric period, often to mark the graves of the dead or to define significant places in the landscape. That a stone with a possible cupmark should sit on such a mound is consistent with patterns seen elsewhere in Ireland, where rock art and funerary monuments occasionally occur together. But the ambiguity here is the thing. The feature is small enough, and the stone weathered enough, that the hollow could plausibly be natural, a product of erosion or the particular character of the rock rather than deliberate carving. That uncertainty has not been explained away.