What it represents, however, is one of the most common and most quietly mysterious features of the Irish archaeological landscape: a fulacht fia, a type of prehistoric cooking site found in their thousands across the island, and almost always near water.

A fulacht fia typically consists of a trough, often timber-lined, into which water was poured and then heated by dropping stones that had been fired in an adjacent hearth. The stones eventually shatter from the repeated thermal stress, and it is this accumulated mound of broken, burnt material, dark and scorched, that survives in the ground long after everything organic has disappeared. The Cooles example survives as a partially denuded spread of this burnt material, meaning the mound has been worn down over time, likely by centuries of grazing and agricultural activity. The proximity to the well is entirely characteristic; access to a reliable water source was not incidental but fundamental to how these sites functioned. Most fulachtaí fia date to the Bronze Age, roughly 2000 to 500 BC, though some have produced dates outside that range, and their precise purpose remains a subject of genuine debate among archaeologists, with cooking, brewing, and textile processing all proposed as possibilities.