Not a hearth, not a furnace in any conventional sense, but an oval hollow with a small flue running off to the south-east, filled with burnt clay, charcoal, and what the excavators described plainly as waste material. Three further pits lay just eight metres away, interpreted as deposits for the debris from whatever process was happening here. The whole arrangement is quiet and functional, the kind of feature that leaves more questions than answers.

The pit came to light in 2007, excavated ahead of the N9/N10 Kilcullen to Waterford road improvement scheme, one of many sites uncovered along that corridor as archaeologists worked in advance of the machinery. Radiocarbon dating of charcoal from the fill placed the activity somewhere between 750 and 408 cal BC, a range that spans the late Bronze Age into the early Iron Age in Ireland. That broad span reflects the nature of radiocarbon dating rather than any vagueness in the archaeology; the material itself was clear enough. What the pit was actually used for is less certain. The combination of intense burning, a flue, and associated waste pits suggests some kind of industrial or craft process, possibly related to metalworking or food processing, though the evidence does not point firmly in either direction. Features of this kind are not especially rare in Irish prehistory, but they are rarely glamorous enough to attract much attention, which is perhaps why they remain so poorly understood.