In the overgrown sections of this west-north-west to east-south-east drain, short, intermittent patches of burnt stone and charcoal break the surface, the quiet residue of a burnt mound.

Burnt mounds are among the most common prehistoric monuments in Ireland, yet they remain poorly understood. They consist of the accumulated debris from a repeated process: stones were heated in fire, then dropped into a water-filled trough to bring it rapidly to the boil. The cracked, fire-shattered stones were raked out and piled to the side, building up over time into the low, often horseshoe-shaped mounds that survive today. The activity is generally dated to the Bronze Age, though the precise purpose, cooking, bathing, textile processing, or some combination, is still debated. What makes the Lismacbryan example quietly notable is its setting: the wet pasture immediately to the south would have provided exactly the kind of reliable water source these sites typically required, and the proximity of a second burnt mound roughly 100 metres to the north-west suggests that this corner of Sligo saw repeated or prolonged use of this kind.