It is a fulacht fia, a type of site found across Ireland in the thousands, typically consisting of a horseshoe-shaped mound of shattered stone surrounding a trough that was once filled with water and heated by dropping fire-scorched rocks into it. The precise purpose of these sites is still debated, with cooking the most widely accepted explanation, though uses ranging from brewing to bathing have been proposed. What makes this particular example notable is its position: not in the bog itself, but just at its margin, a liminal placement that seems almost deliberate.

The site at Baunmore is one of two possible fulachta fia identified at this location by the Irish Archaeological Wetland Unit in 1996. The Wetland Unit was a dedicated research initiative focused on Ireland's boglands and their surroundings, environments that have a remarkable capacity to preserve organic material, including the wooden troughs and even food remains that are rarely found at drier sites. Fulachta fia are generally dated to the Bronze Age, though they continued to be used across a broad span of Irish prehistory. The proximity to Littleton Bog is significant: bogs were not simply wastelands in the ancient landscape, but places with practical and possibly ritual importance, and the clustering of activity at their edges is a recurring pattern in Irish wetland archaeology.