Three of the gallery stones, the upright slabs that line the interior of this wedge-shaped megalithic burial chamber, bear rock art. These are not grand carvings but quiet, deliberate marks: a single cup-and-circle, twelve shallow cup-marks, two further possible cup-marks, and a penannular circle, meaning a nearly complete ring left open at one point. Cup-and-ring marks of this kind are found across Atlantic Europe and date broadly to the Neolithic and Bronze Age periods, though their precise meaning remains unresolved. That they appear here on the structural stones of a tomb, rather than on open outcrop rock, makes their presence particularly close and considered.

The rock art was recorded by Judith Cuppage in 1986, in her detailed survey of the Corca Dhuibhne peninsula. Her work also clarified something that had puzzled earlier map-readers: the feature labelled as a 'Gallaun', a standing stone, to the south-west of the tomb on both the first and second edition Ordnance Survey six-inch maps is almost certainly not a separate monument at all, but a single outer-wall stone that stands at the western end of the tomb's southern side. Ruaidhrí de Valera and Seán Ó Nualláin had also noted this stone in their 1982 survey of megalithic tombs across Counties Cork, Kerry, Limerick, and Tipperary. The reclassification matters because it draws the apparent standing stone back into the tomb's own structure, making the monument slightly more complete than the maps alone would suggest.