It is easy to miss, and easier still to misread. What it actually represents is one of the most common yet persistently mysterious monument types in the Irish archaeological record: a fulacht fia, a mound composed almost entirely of burnt and fire-cracked stone.

Fulachtaí fia are found in their thousands across Ireland, most dating from the Bronze Age, roughly 1500 to 500 BC. The typical interpretation is that they were cooking sites. The method involved heating stones in a fire and then dropping them into a water-filled trough to bring it to a boil, a technique that leaves behind exactly what survives here: a spreading horseshoe or circular spread of discarded, shattered stone, darkened by heat and accumulated over repeated use. The mound at Bawnmore measures roughly 20.7 metres in diameter and stands about 0.6 metres high, modest dimensions but broadly typical of the type. Some researchers have proposed alternative uses for these sites, including textile processing or bathing, though cooking remains the most widely accepted explanation. The name itself, sometimes rendered as fulacht fiadh, is an early Irish term loosely associated with outdoor cooking or the cooking of wild game.