It belongs to a category of sites that only reveal themselves under specific conditions, when growing crops respond differently to buried features beneath the soil, producing variations in colour and height that, seen from above, trace the outlines of long-vanished structures. Without a drone, it might have remained unrecorded indefinitely.

On 21 July 2018, Brian Dwyer and James Burke photographed the site from the air and identified what the resulting images showed: a fosse, the term for a defensive or enclosing ditch, describing a near-complete circle, with a gap in the north-east quadrant that most likely marks the original entrance. Within the enclosure, in the northern sector, there appears to be a smaller ring-ditch of around five metres in diameter, which could indicate a separate internal structure, perhaps a burial feature or the foundation of a building, though the evidence at present is limited to the cropmark alone. A field boundary running roughly east to west sits immediately to the south of the enclosure, its upstanding form a contrast to the buried monument it borders. Around 220 metres to the north-north-east, a second enclosure has also been recorded, raising the possibility that this part of Duninga preserves the traces of a more extensive early settlement or landholding pattern than the surface of the landscape currently suggests.