The feature in question is a fulacht fia, a type of monument found in great numbers across Ireland, typically Bronze Age in origin, and generally understood to have functioned as outdoor cooking places where water was heated by dropping fire-cracked stones into a trough. What makes this one quietly interesting is precisely its elusiveness: the burnt material that once marked the surface has long since ceased to be visible, leaving only the record of what was once apparent to anyone who walked the field.

The site was noted in the 1940s as part of the Schools Manuscript collection, a nationwide folklore-gathering initiative that captured local knowledge from communities across Ireland. At the time, Mrs J. Dineen's land at Knockacappul held a feature described as semicircular, roughly 1.21 metres in diameter and 1.52 metres high. Those dimensions suggest a reasonably substantial mound of heat-shattered stone and charcoal-darkened earth, the characteristic spoil heap that accumulates beside a fulacht's central trough after repeated use. Local knowledge passed down after that recorded that burnt material was once visible on the surface, though even that trace had faded by the time anyone thought to document it formally.