It is a fulacht fia, a class of site found in its thousands across Ireland, typically dating to the Bronze Age, and still not fully understood after decades of excavation and experiment.

Fulachtaí fia, to use the plural, are generally interpreted as outdoor cooking sites. The typical arrangement involves a trough dug into the ground, often timber-lined, which would have been filled with water. Stones were heated in a nearby fire and dropped into the trough to bring the water to a boil, and the cracked, fire-shattered stones were then raked out and piled to the side. It is those distinctive burnt, fragmented stones, accumulating over repeated use into a mound, that archaeologists now recognise as the signature of the site. The horseshoe or kidney shape of the mound reflects the trough sitting at its open centre. Experiments have shown the method works efficiently, and replicated troughs have successfully cooked joints of meat, though some researchers have proposed additional or alternative uses, including bathing, textile processing, or brewing. The sites cluster near water sources, which Knappagh More, like much of Sligo, has in ready supply.

Beyond its location in this north Connacht townland, specific details about this particular site remain limited in the current record. What can be said is that its presence here fits a broader pattern across the Irish midlands and west, where Bronze Age communities left behind these quiet, functional monuments in the soft ground beside streams and wetlands, evidence of organised, repeated activity in a landscape that has since changed almost beyond recognition.