It was recorded and then, in cartographic terms at least, quietly forgotten. The enclosure measures roughly 48 metres northeast to southwest and 33 metres northwest to southeast, its boundary formed not by an upstanding bank but by a scarp, a slope or step cut into the ground, rising to a maximum height of 1.4 metres along its northeastern to southern arc, and dropping inward by about half a metre on the remaining sides. There is no visible fosse, the ditch that typically accompanies such earthworks, and no identifiable entrance gap survives.

What makes this site particularly worth pausing over is its immediate company. A rath, the ringfort type so common across the Irish countryside, lies roughly 200 metres to the west, and a wedge tomb sits approximately 80 metres to the northeast. Wedge tombs are megalithic burial monuments, generally dating to the later Neolithic and early Bronze Age, named for the characteristic way their chambers taper in height and width from front to back. The clustering of monument types in this small area of Usna suggests a landscape that was used and marked over a very long span of time. The enclosure itself is harder to date or categorise precisely; without a fosse or entrance, its function remains open, and its absence from all but a single map edition means it has attracted little sustained attention.