When a portion of it was recently cleared, what emerged was not the expected arrangement of cups and rings that characterises most Irish prehistoric rock art, but something altogether more puzzling: a D-shaped form, its long axis running north to south, with a slight indent pressed into its straight western side. The groove defining it is narrow, just three to four millimetres wide and two to three millimetres deep, cut with a deliberateness that is hard to dismiss.

The site lies roughly 33 metres east of a separate, already recorded rock art panel at Derreennaclogh, which suggests this plateau was a place people returned to, and marked, over time. Rock art in Ireland typically consists of abstract motifs, most commonly cup marks and concentric rings, pecked into stone surfaces during the Neolithic or Bronze Age. The D-shaped motif here does not fit that tradition, and the possibility that it is of more recent origin has not been ruled out. What complicates any easy judgement is that the turf covering was only removed shortly before the site was examined, meaning the carving had not been exposed to weathering or scrutiny before. A collapsed drystone wall was also uncovered nearby, buried just beneath the sod around 25 centimetres to the west of the motif, hinting at a longer history of human activity on this ground. Crucially, only part of the rock surface has been cleared. Further motifs may still lie beneath the remaining turf, their nature entirely unknown.