A circular enclosure, invisible at ground level, betrays its presence through differential crop growth, the classic mechanism of a cropmark, where buried ditches and banks cause the plants above them to grow at slightly different rates, producing patterns that become legible only when viewed from altitude. What makes this particular site stand out is its bivallate character, meaning it was defined not by a single surrounding ditch and bank, but by two concentric circuits, a feature associated in Irish archaeology with enclosed settlements of some status.

The enclosure was identified from aerial photographs taken by Michael Moore on 16 July 2006, over level tillage ground, the kind of flat, cultivated field where cropmarks tend to show most clearly. The circular form and the double boundary are the extent of what can be confirmed without excavation. Bivallate enclosures of this kind are generally understood within the broad category of enclosed farmsteads or ringforts, a form of settlement that was common across Ireland during the early medieval period, though without further investigation it is not possible to assign a precise date or function to the Ballyguile More example.