This is a fulacht fia, a type of prehistoric cooking or processing site found widely across Ireland, typically consisting of a crescent-shaped heap of fire-cracked stones surrounding a central trough. The trough, usually timber-lined, would have been filled with water and heated by dropping stones from a fire directly into it. At Murrooghtoohy, that central flat space, roughly three metres square, is still visible within the mound's curve, its west-facing mouth partially closed off by a low stony bank. The mound itself is substantial: nearly sixteen metres east to west, just over twelve metres north to south, and rising to about 1.7 metres at its outer edge.

What makes this particular example quietly interesting is the degree to which the landscape around it still speaks to its original logic. Ten metres to the north-west, a stock watering pond is fed by a lintelled gryke, a natural fissure in the karst rock fitted with a stone lintel to control the flow of water. Eighteen metres to the north-north-west, a spring sits enclosed within a drystone wall. These water sources may well be connected to the site's prehistoric use, since a reliable water supply was essential to the fulacht fia process. Adding another layer, a collapsed limekiln, a later structure used for burning limestone to produce agricultural lime, abuts the northern side of the mound, a reminder that the same spot attracted human activity across very different periods. The eroded eastern face of the mound exposes the burnt stone rubble within, giving a clear cross-section of its composition. Robinson's map of 1977 recorded a fulacht fia roughly 120 metres to the south-south-east, but no feature exists at that location, and it is generally accepted that the mapping was simply slightly off, and this is the site intended. It also appears in George Cunningham's 1980 work, Burren Journey West.