A fulacht fia is a type of ancient burnt mound, the remains of an outdoor cooking method used widely across Ireland during the Bronze Age, in which water-filled troughs were heated by dropping fire-cracked stones into them. The stones, once spent, were piled to the side, forming the characteristic mound shape. At Carricklawn, that mound takes a horseshoe form.

Archaeological testing carried out under licence 07E0912 revealed the spread of the burnt mound measuring approximately 13.5 metres by 16.5 metres, surviving to a depth of around 0.3 metres. Within it, excavators identified the trough itself, about 1.4 metres wide and 0.3 metres deep, which would once have held water for the heating process. The work was recorded by Keith in 2008, and despite the relatively modest surviving depth of the mound material, the site was considered significant enough to be preserved in situ rather than removed, left intact beneath the accumulated soil in an area earmarked for landscaping. That decision means the structure endures, sealed below ground in a kind of accidental archive, with Wexford harbour visible above it on the slope.