It does not announce itself with earthworks or stonework. It exists, at least provisionally, as a shadow in the grass, a subtle difference in crop colour and growth that only becomes legible from the air.

The enclosure at Cappauniac came to light through an aerial photograph, reference Air Corps V311/2966-7, which revealed a roughly D-shaped cropmark approximately twenty metres in diameter. Cropmarks of this kind form when buried features, such as the filled-in ditches of an ancient enclosure, affect the vegetation above them. Soil that once filled a ditch tends to retain more moisture and organic matter, producing a band of slightly lusher or differently coloured growth that stands out clearly in dry conditions when viewed from altitude, but disappears entirely at ground level. The site sits in undulating upland terrain, on a slope that runs off the edge of a flat ridge down towards a small river. A natural ridge also runs roughly north to south across the same field, which complicates any straightforward reading of the landscape, since natural and human-made features can be difficult to disentangle without excavation. The "possible" designation is careful and deliberate; without ground investigation, the D-shape remains a candidate rather than a confirmed archaeological site.