Three boulders to each row, spaced roughly 1.5 metres apart, with the rows themselves separated by about 3 metres: the arrangement points radially outward from the cairn, oriented on a north-east to south-west axis. It is the kind of thing that looks almost accidental until you notice that it is not.

The description comes from Stefan Bergh's 1995 study of the megalithic landscapes of the Cúil Irra region, the peninsula in County Sligo that includes Knocknarea and some of the most densely concentrated prehistoric monument complexes in Ireland. Bergh noted that the outermost pair of boulders in the arrangement is actually set into a low bank, one that curves around and terminates just to the west of the rows. That bank connects to a low platform lying to the south of the cairn itself, suggesting that the stones, the bank, and the cairn were conceived as parts of a single, structured space rather than as independent features. The boulders themselves are relatively modest in scale, around 0.4 metres, so this is not a dramatic monument in the visual sense. What makes it unusual is the combination: the radial placement relative to the cairn, the regularity of the spacing, and the integration with the surrounding earthwork, none of which correspond neatly to any standard monument type. The label "anomalous" in the formal record is, in this case, genuinely earned.