Only from above, in the kind of aerial orthophotography produced by Ordnance Survey Ireland, does the partial outline of a circular enclosure reveal itself, traced in the soil by the faint depression of a fosse. A fosse is simply a ditch, typically cut to define or defend a boundary, and here it curves in a rough arc roughly twenty metres across before disappearing back into the improved agricultural ground that has, over generations, swallowed most of the evidence.

Enclosures of this circular type are among the most common archaeological features in the Irish landscape, though that familiarity does not make any individual example less intriguing. They range in origin from early medieval ringforts, which served as enclosed farmsteads, to prehistoric ceremonial sites, and distinguishing between them without excavation is rarely straightforward. What survives at Coolnahila, in the townland historically associated with the Palmer name, is fragmentary enough that its precise function and date remain unconfirmed. The site was recorded and compiled by archaeologist Caimin O'Brien, with the record uploaded in June 2020, suggesting it was identified or formalised as part of relatively recent survey work drawing on remote sensing rather than ground investigation.

For anyone curious enough to seek it out, the practical reality is that this is agricultural land and the visible trace on the ground is likely to be subtle at best, particularly in seasons when grass growth is dense. The fosse, where it survives, would appear as a shallow linear depression following a curved path. The OSi orthophotography that brought the site to light is publicly accessible through the Ordnance Survey Ireland map viewer, which allows comparison between aerial imagery and the current ground surface, and that digital approach may ultimately offer more clarity than a visit to the field itself. The site sits as a reminder that Irish farmland is layered with features that drainage, ploughing, and land improvement have reduced to near-invisibility, and that archaeology increasingly depends on what the camera sees rather than what the eye can find.