A fulacht fia is a type of ancient cooking site, typically identified by a distinctive horseshoe-shaped mound of fire-cracked stones beside a water source. The example at Grange has an unusual visible feature: the burnt material here has been piled and faced with stone on either side to form what amounts to a low fence or revetment, giving the mound a more structured appearance than many comparable sites.

The site was noted by Lee as far back as 1932, placing it within a long tradition of local antiquarian observation in North Cork. Archaeologists believe the original location of the fulacht fia was probably adjacent to where the mound now sits, suggesting the material may have shifted or been partially moved at some point. Fulachtaí fia are found in enormous numbers across Ireland, predominantly dating from the Bronze Age, and the prevailing theory holds that they were used for boiling water, either for cooking meat or possibly for other purposes such as bathing or textile processing. Water was heated by dropping fire-heated stones into a trough, and the cracked, discarded stones accumulated over repeated use into the characteristic mounds that survive today. The Grange example, sheltered by trees and positioned close to its stream, fits the pattern well.