Beneath the turf lies a spread of burnt material, the characteristic signature of a fulacht fia, and what makes this particular site quietly interesting is that a second example of the same type lies just thirty metres to the south-west, the two monuments occupying the same field, close enough that they were almost certainly related in use.

A fulacht fia, sometimes called a burnt mound, is among the most common prehistoric monument types in Ireland. The basic principle was straightforward: a trough, often timber-lined or cut into the ground, was filled with water, then heated stones were dropped in to bring the liquid to a boil. The shattered, fire-cracked fragments of those stones accumulated over repeated use into the horseshoe-shaped or oval spreads that survive today. The majority date to the Bronze Age, roughly 2000 to 500 BC, though some sites show evidence of use across much longer periods. What drew people back to this particular corner of Garraun more than once, and possibly across generations, may have something to do with the spring recorded to the south-west of the site. A reliable water source was a practical necessity for any fulacht fia, and a natural spring would have made this ground an obvious and repeatedly useful location.