Cropmarks form when buried features, whether ditches, walls, or pits, affect how plants grow overhead; crops above a sunken or filled-in hollow tend to grow taller and greener, revealing the outline of whatever lies beneath when viewed from altitude, particularly in dry conditions when the contrast is sharpest. In this case, the shape that emerges is irregular, which is part of what makes it ambiguous.

The feature was identified from Google Earth aerial photography taken in November 2005, the image showing a sunken area of approximately thirty-two metres in diameter. The classification as an enclosure is provisional at best. One explanation offered is that it could simply be the trace of a shallow gravel quarry, the kind of small-scale extraction that was commonplace in rural Ireland for road-making and agricultural use, and which left behind slight depressions that time and ploughing gradually softened but never fully erased. Without excavation or further survey, the two possibilities, archaeological enclosure or industrial hollow, remain genuinely unresolved. The details were compiled by Caimin O\'Brien, drawing on information provided by Jean-Charles Caillère.