What survives is a spread of burnt material roughly fourteen metres across at its widest, the flattened footprint of a fulacht fia, one of the most common yet persistently puzzling monument types in the Irish archaeological record. The mound that once marked the site has been removed and spread across the infield, which means that what was already subtle has become nearly invisible.

A fulacht fia, sometimes called a burnt mound, is the remains of an ancient outdoor cooking or industrial site, typically consisting of a horseshoe-shaped mound of fire-cracked stone accumulated beside a trough and a water source. The method involved heating stones in a fire and dropping them into a water-filled pit to bring it rapidly to the boil, a technique that leaves behind enormous quantities of shattered, heat-damaged stone. These sites cluster thickly across Ireland and date mostly to the Bronze Age, roughly 1500 to 500 BC, though some span a wider range. The Dunbeacon example fits the classic pattern in one key respect: its position beside a stream valley, which would have provided the reliable water supply the process required. A spread of fourteen metres by twelve metres suggests this was a reasonably substantial accumulation before the mound was levelled, likely during agricultural improvement of the land.