What makes it quietly unsettling is what the disturbed eastern sector has begun to reveal: bone, possibly human, edging through the soil. This is a mound barrow, a prehistoric burial monument of the kind raised over the dead across Ireland during the Bronze Age, and something about it has clearly been shifted or interfered with at some point, though by whom and when is not recorded.

Locally, the mound is known as Muilleann Sidhe, a name that translates roughly from Irish as the fairy mill or mill of the fairy mound. The sidhe, in Irish tradition, were the supernatural beings said to inhabit ancient earthworks, and the name alone suggests the mound held a particular place in local memory long after its original purpose was forgotten. The mound itself is modest in scale, about six metres in diameter and roughly one metre in height, but the limestone revetment, where stones are set around the base to retain and define the structure, gives it a deliberate, constructed quality that separates it from a natural rise in the ground. Recorded by McCaffrey in 1952, who also noted the remains of a house associated with the same location, the site carries at least two distinct layers of occupation and use, one prehistoric, one more recent, folded into the same small patch of Galway hillside.