This is a burnt mound, a type of prehistoric site found widely across Ireland and Britain, typically consisting of fire-cracked and shattered rock discarded after being used to heat water in a trough or pit. The method was simple enough: stones were heated in a fire, then dropped into a water-filled hollow to bring it rapidly to the boil. Over time, the spent, fractured stones accumulated into a mound, and it is these heat-shattered remains that survive today at the southern end of the plateau, sitting in a natural hollow in the landscape.

The site was recorded by Keegan in 2016, who described it as a fulacht fia, the older and more widely used Irish term for what archaeologists now more neutrally call a burnt mound, since the function of such sites remains a matter of ongoing discussion. Keegan's study characterises it as a scattered mound of sandstone and limestone with burnt sandstones present throughout, a description that fits the typical profile of these features well. The location within an established field system suggests the site sat within a managed, inhabited landscape rather than in isolation, which is consistent with the broader prehistoric use of the Termon plateau.