It is, in fact, the remains of a fulacht fia, one of the most common yet least understood monument types in the Irish archaeological landscape. Thousands of these sites survive across Ireland, and while their precise function is still debated, the working theory is that they served as Bronze Age cooking places: a trough filled with water, stones heated in a fire, then dropped into the trough to bring the water to a boil. The burnt and shattered stones were raked out and piled to one side after each use, and it is exactly that accumulated heap of fire-cracked material that forms the characteristic horseshoe-shaped mound visible at so many sites today.

The Rathfelane example follows the pattern closely. It sits on the north side of a stream, which is typical; proximity to a reliable water source was essential to the whole process. The mound of burnt material has been noted as apparently disturbed, meaning some of the accumulated stones and charred earth have been shifted at some point, whether by agricultural activity, land clearance, or simple erosion over the centuries. The site sits within pasture, which has likely helped preserve whatever remains, since ploughing would cause considerably more damage than grazing livestock. Beyond these details, the particular history of this individual mound is largely unrecorded.