Eskers are long, sinuous ridges of gravel and sand deposited by meltwater streams flowing beneath glaciers during the last Ice Age, and they were often treated as significant landmarks in the Irish landscape, used as territorial boundaries, routeways, and burial sites across many periods. This particular mound, sitting at the ridge's summit near Ballydavid, measured roughly 7.5 metres north to south and 6.5 metres east to west, rising just 1.3 metres above the surrounding ground. That modest profile concealed a surprisingly unusual internal structure, and no visible trace of it remains today.

When the mound was excavated by Rynne in 1985, prompted by the threat of quarrying in the area, what emerged was a cairn-like core, a compact mass of stones at the heart of the mound, covered over with earth and stones and enclosed within a low, rough kerb. That kerb formed three sides of a square, left open on the north-east side, an arrangement that does not map neatly onto any single well-known tradition of mound construction in Ireland. The finds were equally mixed: animal bones, oyster shells, fragments of iron, bronze and glass, and a decorated bone plaque. Oyster shells found some distance inland and worked bone carrying decoration suggest deliberate deposition rather than casual accumulation. Rynne proposed a late-medieval date for the structure while acknowledging it as enigmatic, a word that in archaeological writing tends to signal genuine uncertainty rather than false modesty. Whether the mound served a funerary function, a ritual one, or something else entirely, the evidence left behind resists a clean interpretation.