This is a fulacht fia, a type of ancient cooking or processing site typically identified by a horseshoe-shaped mound of heat-shattered stone surrounding a depression where a water trough once sat. The method was straightforward: stones were heated in a fire and then dropped into the water-filled trough to bring it to boiling point, repeatedly. Thousands of such sites survive across Ireland, mostly dating to the Bronze Age, yet each one represents an accumulation of repeated use, a place people returned to again and again over generations.

The spread of burnt material at this particular site measures roughly eight metres north to south and eleven metres east to west, modest dimensions that suggest a well-used but not unusually large example. What makes Coolalta worth pausing over is the density of related archaeology in the immediate vicinity. A second fulacht fia lies only about ten metres to the west, close enough that both sites may have been used by the same community, perhaps even at the same time. Around a hundred metres to the north-east, a spread of dark-coloured soil hints at further buried activity, though its nature has not been fully established. Finding one fulacht fia in a field is unremarkable in the Irish midlands and south; finding two within a stone's throw of each other, with additional anomalies nearby, suggests this particular patch of Cork farmland saw sustained prehistoric use across a considerable period.