What gives it away is a cropmark, the faint but readable signature left in growing vegetation when buried features alter how deeply roots can reach or how much moisture the soil retains. In this case, the buried outline of a fosse, a defensive or boundary ditch, shows up clearly enough in aerial photography to trace most of the circle's arc.

The enclosure came to light in an aerial photograph taken on 19 June 2020, attributed to photographer Dan Lenehan. Cropmark sites of this kind are frequently associated with early medieval ringforts or earlier prehistoric enclosures, though without excavation it is impossible to say which applies here. The western quadrant shows natural soil staining consistent with wetter ground, which may reflect the original ditch holding moisture differently from the surrounding field. Not all of the enclosure survives intact: the northern and north-eastern arc has been cut through by scarping beside the R693 public road, meaning the road's construction or maintenance at some point removed that section of whatever earthwork or buried feature once completed the circle.