This is a fulacht fia, a type of site found in considerable numbers throughout the Irish countryside, typically identified by a horseshoe-shaped or kidney-shaped mound of burnt and shattered stone, usually positioned close to a water source.

The basic principle of a fulacht fia involves heating stones in a fire until they are intensely hot, then dropping them into a water-filled trough, usually timber-lined, to bring the water to a boil. The stones crack and fragment with repeated heating and cooling, and over time the discarded material accumulates into the distinctive mound that survives today. Thousands of these sites have been recorded across Ireland, with particularly high concentrations in Munster, and while cooking is the most widely accepted explanation for their function, some archaeologists have proposed uses ranging from bathing to textile processing. The Rogerstown example in Kilkenny belongs to this broad, well-distributed class of monument, modest in appearance but deeply embedded in the daily life of prehistoric communities.