The motifs are modest in scale but precise in form: a cup-and-two-rings on the level upper surface, a single cupmark beside it, and a further cupmark on the north-west facing side of the stone. Cup-and-ring marks are among the most widespread forms of prehistoric rock art in Atlantic Europe, consisting of a small circular depression, the cup, surrounded by one or more incised concentric rings. They appear across Ireland, Britain, and Iberia, concentrated broadly in the Neolithic and Bronze Age periods, and their purpose remains genuinely uncertain.

The site at Kealduff was identified and described by Aoibheann Lambe, whose record notes the particular combination of motifs and their placement across different faces of the same stone. That the carving extends onto the north-west side suggests the rock was worked as a three-dimensional object rather than simply as a flat surface, which is a detail worth pausing on. Peat coverage has historically both protected and obscured rock art across Ireland, and sites like this one are often encountered only when erosion or cutting exposes the stone surface. How long this particular example had been visible before it was formally recorded is not known.