Fulachtaí fia, sometimes called burnt mounds, are the residue of an ancient cooking or industrial process in which stones were heated in a fire and then dropped into a water-filled trough to bring the water to a boil. Over repeated use, the stones shatter and discolour, accumulating into the low, horseshoe-shaped spreads of dark, crumbly material that survive in the ground for thousands of years. They are found in enormous numbers across Ireland, typically in low-lying, wet ground, and most date to the Bronze Age.

The spread of burnt material at Rooves More is the kind of trace that reclaimed agricultural land can quietly preserve even as the surface around it is transformed. When boggy or marginal ground is drained and brought into pasture, the earthworks associated with a fulacht fia can be partially levelled or obscured, leaving behind little more than the discoloured soil and fire-cracked stone that betray where the mound once stood. The site at Rooves More appears to be in exactly this condition, its original form diminished by land improvement but its archaeological signature still readable in the earth.