That gap is itself telling. Hut sites, the collapsed or grass-grown remains of small circular or rectangular dwellings, are among the most common archaeological features in the Irish countryside, and among the least glamorous. They surface on upland ground, in areas of marginal agriculture, and along the edges of bog, where the turf has preserved their low stone walls or earthen footprints against centuries of weather and forgetting.

Without further documentation, it is difficult to say whether this particular example belongs to the early medieval period, when single-family farmsteads were scattered across the Irish uplands, or to a later era of seasonal occupation, when herdsmen and their families would move cattle to summer pasture in a practice known as booleying. Both leave similar traces: a low circular or oval enclosure, sometimes with the ghost of an entrance, sometimes with nothing more than a slightly raised ring in the ground to suggest a wall once stood there. Killernan, as a place-name, may itself carry older meanings, though its precise derivation is a matter for specialists in Irish toponymy rather than casual speculation.