A fulacht fia, the term given to the horseshoe-shaped mounds of burnt and cracked stone left behind by Bronze Age cooking activities, once sat clearly enough on the ground here to be marked on the 1940 edition of the Ordnance Survey six-inch map. By 1987, it had become invisible at ground level, swallowed by vegetation and time.

When it was recorded in 1939, the mound still held its shape: a C-form open to the northwest, roughly nine metres wide, between thirty and fifty centimetres high, with an interior diameter of around six metres. That particular profile, a curved mound enclosing a central pit or trough, is characteristic of the type. Fulachtaí fia are found in their thousands across Ireland, typically close to water sources, and the location here fits the pattern precisely: an overgrown hollow near the source of a stream, on a north-facing slope above the west-to-east valley of the Blackwater stream. The site was noted by Ranson in 1945, a reference that at least confirms it was still recognisable as a feature within living memory of the first recording. Roughly 170 metres to the north-northeast lies what may be a standing stone, a proximity that might be coincidental, or might reflect the tendency of prehistoric communities to cluster different kinds of monument within the same stretch of landscape.