Cropmarks of this kind appear when buried ditches or banks, long since levelled, encourage differential growth in whatever crop happens to be growing above them. In this case, aerial imagery captured in July 2021 reveals an enclosure roughly 85 metres along its north-east to south-west axis and approximately 67 metres across, dimensions that place it comfortably in the range of a substantial early medieval or prehistoric enclosed settlement.

The site came to light in January 2023 when Ms Faith Bailey drew attention to its appearance in Google Earth imagery taken during the summer of 2021, a period when dry conditions and a ripening crop had made the underlying archaeology unusually legible. One particularly telling detail is the relationship between the monument and an old townland boundary. Ordnance Survey historic mapping recorded a north-south line at this exact location, separating the townland of Raheenglass to the west from Coolafancy to the east, and that boundary ran directly across the western sector of the enclosure. The boundary has since been removed from the landscape, but its former presence here raises a quiet question about whether early medieval or even older features sometimes influenced the drawing of later administrative lines, or whether the coincidence was simply the result of centuries of field reorganisation happening to align.