The feature only becomes legible from above, where a difference in plant colour or growth reveals the arc of an ancient ditch beneath the soil surface. These cropmarks form when buried features, particularly ditches that retain moisture or disturbed soil that drains differently, cause the vegetation above them to grow at a slightly different rate or shade than the surrounding crop. The result, invisible at ground level, can be remarkably sharp when seen from the air or in satellite imagery.

What survives here is the cropmark of a semi-circular enclosure, roughly 48 metres across on its north-south axis, defined by a ditch that traces an arc from south-southwest to north-northwest. The enclosure appears to have originally formed a complete or near-complete circuit, but its northern portion has been cut through by a later field boundary running roughly north-northwest to south-southwest. That kind of truncation is common where agricultural activity has persisted across centuries, slowly erasing earlier features. Enclosures of this general character and scale in Ireland are frequently associated with early medieval settlement, the ringfort tradition that once saw thousands of such enclosed farmsteads distributed across the Irish countryside, though without excavation it is not possible to assign this particular example to any specific period or function.