The typical fulacht fia consists of a horseshoe-shaped mound of fire-cracked stones and charcoal-blackened earth, the accumulated debris of repeated episodes of heating stones in a fire and dropping them into a water-filled trough to bring it to the boil. They date most commonly to the Bronze Age, though examples span a wide chronological range, and their sheer frequency in the Irish landscape, many thousands have been recorded, suggests they were a routine feature of daily or seasonal life rather than anything ceremonial.

What makes the Knocknagoul example notable, in a quiet and slightly melancholy way, is what happened to it relatively recently. Around 1975, according to local information gathered at the time, the mound of burnt material that would have marked the site was levelled, the spoil shifted southward and deposited along the bank of the nearby stream. The archaeology was not destroyed so much as redistributed, the ancient accumulation of scorched stone and dark earth now sitting in an unremarkable bank rather than its original mounded form. It is a reminder of how many such sites have been quietly erased or rearranged by ordinary agricultural work, with no particular malice and often no awareness of what was being moved.