It is a fulacht fia, a type of ancient cooking site found in enormous numbers across Ireland, typically dated to the Bronze Age. The characteristic form is a horseshoe or kidney-shaped mound of fire-cracked stone and charcoal, the accumulated debris from a simple but effective method of heating water: stones were heated in a fire, then dropped into a water-filled trough until the contents boiled. The Cusloura example follows this pattern closely, kidney-shaped, roughly ten metres long and thirteen metres wide, rising just over half a metre above the surrounding ground, with an opening of about 1.8 metres facing north-north-east.

Fulachtaí fia are among the most common prehistoric monuments in Ireland, yet individual examples tend to attract little attention, partly because they are so numerous and partly because their low, grassy profiles blend so readily into farmland and bog. What they collectively represent is a sustained, organised use of the Irish countryside across many centuries of the Bronze Age, though the precise social context, communal feasting, food processing, textile working, or something else entirely, remains a matter of ongoing discussion among archaeologists. The Cusloura mound, sitting in its field of rough grazing, is a small but legible piece of that much larger pattern.