The site is known almost entirely through cropmarks, the phenomenon by which buried ditches and banks cause overlying crops or grass to grow at subtly different rates, producing outlines that only become readable in aerial or satellite photography. In this case, the fosse, meaning the enclosing ditch that would originally have defined the monument's perimeter, shows up as a roughly circular mark when viewed on satellite imagery, measuring approximately 40 metres north to south and 37 metres east to west.

The enclosure was identified and reported by Jean-Charles Caillère, who recognised the cropmark signature in satellite imagery. Circular enclosures of this general type are found widely across Ireland and can date to various periods, from the prehistoric through to the early medieval, though the surface evidence here offers no firm indication of age. What the record does preserve is a note of relatively recent loss: a field boundary running north-east to south-west, which had cut across the north-western edge of the monument and was already present on the first edition Ordnance Survey six-inch map of the area, was levelled sometime between 2011 and 2015. Field boundaries of that vintage often follow older land divisions or were simply imposed across earlier, already-forgotten features. Either way, its removal means that one more layer of the landscape's accumulated history has been quietly erased.