That ambiguity is not carelessness; it is, in a quiet way, the whole point. A field inspection carried out in 1991 failed to locate the feature at all, leaving its existence in a kind of official limbo, noted but unconfirmed, mapped but not found.

The record traces back to work published by Göran Burenhult in 1980, which catalogued a series of earthworks across a study area in this part of Sligo. Burenhult recorded what he called an assembly of earthworks in Field XIV, grouping them not because they were related in function or date, but because they shared certain broad physical characteristics. The feature in question was listed as Structure 24, Knocknahur North. A neighbouring structure in the same field, Structure 26, corresponds with a ring barrow, a type of prehistoric burial mound defined by an encircling ditch or bank, which survives as a separately recorded monument. Phosphate surveys were also carried out in Field XIV, a technique used in archaeology to detect past human activity through soil chemistry, though Burenhult recorded no further detail about what those surveys revealed in relation to Structure 24 specifically. What the earthwork actually was, whether a field boundary, a burial feature, a platform, or something else entirely, remains unknown.