The mound is a fulacht fia, a type of prehistoric cooking site found in enormous numbers across Ireland, typically consisting of a horseshoe-shaped mound of fire-cracked stones beside a trough. The standard interpretation is that stones were heated in a fire and dropped into a water-filled pit to bring it to a boil, though other theories propose uses ranging from textile processing to bathing. What makes this particular example quietly interesting is less what it is than how thoroughly it has been swallowed by a landscape that did not exist when it was first mapped.

The site appears as a mound on the Ordnance Survey six-inch map of 1937, which means it was visible and at least partially legible in living memory, before the plantation closed over it. A 1934 publication by Bowman recorded two fulachta fiadh in the Moher townland, one on land belonging to a M. O'Callaghan and one on land associated with a Connie Murphy. The mound in the plantation may be one of these two, though which one remains uncertain. That ambiguity is itself telling: in the early twentieth century, local landowners' names were still the most reliable way to pin down a prehistoric site, and the archaeology was understood well enough to note and record, even if not to excavate.