It is a fulacht fia, a type of site found scattered across the Irish countryside in considerable numbers, and one whose quiet, grassy appearance gives little away about its original purpose. A fulacht fia, broadly speaking, is the remains of a prehistoric cooking or hot-water site, typically consisting of a horseshoe-shaped mound of burnt and shattered stone accumulated beside a trough. The accepted interpretation is that stones were heated in a fire and then dropped into a water-filled pit to bring it rapidly to the boil, leaving behind a gradual accumulation of cracked, heat-fractured material.

The Bramblestown example was recorded by Prendergast in 1955, identified in a local listing of such sites in County Kilkenny. Its location beside a watercourse is entirely characteristic of the type; proximity to a reliable water source was a practical necessity, and fulachtaí fia are almost invariably found near streams, springs, or boggy ground. Most date to the Bronze Age, though some have produced evidence of use across longer periods. The choice of pasture ground here means the site has likely survived in reasonable condition, undisturbed by tillage.