It measures roughly 25 centimetres across, about the span of an open hand, and it was cut with a compass or compass-like tool, leaving a clean, geometrically precise ring in the stone. That precision is what sets it apart from the more fluid, pecked motifs that characterise most Irish prehistoric rock art, where rings and cup-marks are hammered rather than incised. Whether this circle belongs to the prehistoric tradition at all, or represents something later and more practical, is the quiet question the site leaves open.

Rock art of this kind, where abstract motifs are worked directly into natural stone surfaces, appears throughout Ireland and is generally associated with the Later Neolithic and Bronze Age periods, roughly 4,000 to 3,000 years ago, though dating individual examples is notoriously difficult in the absence of associated finds or excavation. The compass-drawn quality of the Kealanine circle complicates any easy classification. A compass-drawn line implies a fixed centre point and a measured radius, a kind of geometry that could belong to almost any period. It sits on a flat face of bedrock in open, level ground, which is consistent with other rock art sites, often placed on low, accessible outcrops rather than on dramatic heights.