It is not much to look at, barely a metre high and roughly eight metres across, but the material it is made from tells a quietly remarkable story. The stones are heat-shattered, fractured by repeated cycles of heating and sudden cooling, and the soil around them is heavy with charcoal. This is a burnt mound, or fulacht fiadh, one of the most common yet least understood monument types in the Irish landscape.

Burnt mounds are the remains of what were likely open-air cooking or processing sites, used during the Bronze Age, though some date to other periods. The typical method involved heating stones in a fire and dropping them into a water-filled trough to bring the water to a boil. The stones, unable to withstand the thermal shock indefinitely, would crack and shatter, and the broken fragments were tossed aside into a growing mound of debris. Over centuries of use, these discarded stones accumulated alongside the charcoal from the fires, forming the distinctive low, kidney-shaped or irregular heaps that survive across Ireland in their thousands. At Lackavane, the stream that now cuts through the mound on a westward course has done the work of an accidental section, exposing layers of burnt material in the stream bank and offering a cross-section through the deposit that would otherwise require excavation to see. Most of the mound sits to the south of the stream, where the bulk of that accumulated debris has settled into the pasture over millennia.