What reveals it is a trick of dry summer weather: when soil moisture varies across a field, the crops growing above buried features respond differently, producing faint discolourations visible only from the air. It was one such cropmark, photographed on 16 July 1971, that betrayed the presence of a ring-ditch here, roughly seven metres in diameter.

A ring-ditch is typically the eroded remnant of a circular earthwork, most often a burial monument or a roundhouse enclosure, in which only the outer fosse, or ditch, survives as a shadow in the subsoil. The Danesfort example was identified from aerial photography as the cropmark of precisely such a fosse. What makes the spot quietly remarkable is that it does not stand alone. A second ring-ditch lies approximately ten metres to the south-south-east, suggesting the two features may be related, perhaps a small cemetery cluster of the kind found elsewhere in the Irish landscape, where burial monuments of the Bronze Age or early medieval period accumulated over generations in proximity to one another. Running to the north and south of the ring-ditch, and captured in the same 1971 photograph, are the linear cropmarks of an ancient field system oriented roughly east to west, hinting at a wider organised landscape that once surrounded these monuments, now entirely invisible at surface level.