The circular outline of an ancient enclosure, roughly forty metres across, shows up not as earthwork or stonework but as a cropmark, the faint differential in how crops grow above disturbed or compacted soil, betraying the line of a fosse buried beneath the surface. A fosse is a defensive or boundary ditch, typically dug around a ringfort or similar enclosed settlement, and in this case it left no visible trace above ground. Without an aerial photograph taken in July 1989, it might never have been recorded at all.

What makes the site stranger still is a second cropmark running across the field on a north-south axis, cutting straight through the centre of the enclosure. It is not clear whether this line is older than the enclosure, contemporary with it, or something later entirely. A field fence recorded on the Ordnance Survey six-inch map of 1936 runs just to the south, and that fence, too, appears as a cropmark in the same photograph, which gives a useful sense of scale and layering: a medieval or early medieval settlement outline, a modern field boundary, and an unexplained linear feature, all compressed into a single image taken from the air. The site itself is invisible from the ground.