The outcrop measures only a metre across, its flat upper surface carved with five cupmarks, three of them surrounded by segments of concentric rings. The finest of these consists of two concentric rings with a curved radial groove running outward from the central cup. That combination, a cup enclosed by rings with a channel cutting through them, is among the more elaborate expressions of prehistoric rock art found in Ireland, and on a surface no larger than a desktop, it represents a considered and deliberate act of marking.

Rock art of this type, broadly associated with the late Neolithic and early Bronze Age, is found in clusters across the Iveragh Peninsula in south Kerry, Coomasaharn being one of the more significant concentrations. The site was noted by Finlay in 1973, who recorded the decorated stone as lying within a bog cutting roughly a metre deep at the north-eastern end of the wider complex. The detail matters, because blanket bog both preserves and obscures. Peat accumulates, drainage works alter the landscape, and stones that were visible in one decade can vanish beneath cut and re-deposited material in the next. When the area was surveyed more recently by Alison McQueen and Vera Rahilly, every stone in the vicinity was checked and none could be identified as bearing rock art matching the earlier description. Drainage activity had been noted nearby, which may have disturbed the context entirely.

What remains, then, is a documented absence. The carvings exist in published drawings and written records, including the 1996 archaeological survey of the Iveragh Peninsula by O'Sullivan and Sheehan, but the physical stone could not be relocated on the ground. It is a reminder that rock art, for all its apparent permanence, is vulnerable to the slow and not-so-slow changes of a boggy upland landscape.