It is, in fact, a fulacht fia, one of the most common yet persistently puzzling monument types in the Irish archaeological record. Fulachtaí fia are the remains of ancient cooking sites, typically Bronze Age in date, where water was heated by dropping fire-cracked stones into a trough. The shattered, heat-damaged stones were then discarded in a pile around the trough, forming the characteristic horseshoe or crescent shape that survives today.

This particular example at Annagh More measures twelve metres east to west and eight metres north to south, rising to a height of just over a metre. The opening of the horseshoe faces south-east, which is typical of the form. At that south-eastern edge, a stream is gradually eroding the mound, exposing the burnt material beneath the turf. Within roughly ten metres to the north-east, there is a second possible fulacht fia, suggesting this slope above the Flesk was used repeatedly, or perhaps simultaneously, as a site for this kind of organised activity. The clustering of such monuments is not unusual; they tend to appear near reliable water sources, and the proximity of the river valley here would have made this hillside a practical location for whatever communal work, cooking, or industrial process the sites served.