The trackway, worn parallel to the watercourse through rough grazing land, almost certainly runs directly over the remains of a fulacht fia, leaving nothing visible at the surface for anyone passing by.

A fulacht fia is a type of prehistoric cooking site, typically identified by a horseshoe-shaped mound of fire-cracked stone and charcoal built up beside a stream or other water source. The method involved heating stones in a fire and dropping them into a water-filled trough to bring it to the boil, a process that gradually shattered the stones and created the distinctive burnt mounds that survive across Ireland in their thousands. The Lisdangan example was recorded as a mound on the Ordnance Survey six-inch map of 1937, which suggests it was still a recognisable earthwork within living memory. At some point after that survey, the mound lost whatever height it had, and the farm track that now runs along the stream bank is the most likely explanation for its disappearance from view.