The wall follows a semi-circular line, and it is this shape, rather than any visible monument or carved stone, that has led researchers to suspect the site preserves the outline of an early ecclesiastical enclosure.

Ecclesiastical enclosures are the roughly circular or oval boundaries that once defined the sacred and functional space of early Irish monastic or church settlements, typically dating from the early medieval period. They were not walls in the defensive sense but rather marked a threshold between the religious community and the wider landscape. Over centuries, as the original timber or earthen boundaries eroded or were absorbed into farmland, graveyards frequently fossilised their outlines, the living continuing to bury their dead within the same curving perimeter long after its original meaning had been forgotten. At Adamstown, this possibility was identified by Swan in 1988, who noted the semi-circular form of the graveyard boundary as evidence that such an enclosure may once have existed here. The underlying graveyard itself is a recorded monument, and the enclosure, if genuine, would represent an additional layer of history mapped onto the same ground.