They only reveal themselves from the air, and even then only under the right conditions: as cropmarks, the faint differential in how crops grow over buried soil disruptions, which show up as rings and lines when seen from above during a dry summer.

An aerial photograph taken in July 1989 captured three small ring-ditches sitting within what appear to be two parallel fosses, that is, broad defensive or boundary ditches, running in a north-west to south-east direction. Ring-ditches of this kind are typically the eroded or ploughed-down remains of prehistoric burial mounds, the circular trench that once surrounded a central mound now flattened entirely by centuries of agriculture. The pairing with parallel fosses suggests something more structured was once happening here, though what exactly remains an open question. Adding to the picture, several further ring-ditches have been identified as cropmarks in the surrounding area, to the north-east, south, and south-west. The concentration points to a landscape that was, at some period in prehistory, significantly more populated with monuments than the present fields suggest.