These features, known in Irish as fulacht fiadh, are generally interpreted as the debris from ancient cooking or industrial activity involving heated stones. The process involved dropping fire-cracked rocks into a water-filled trough to bring it to the boil, and the discarded, shattered stones accumulated over time into the characteristic mound shape that survives today. This particular example at Foulkstown measures roughly 14.3 metres northeast to southwest and 12 metres northwest to southeast, with a height ranging between 0.2 and 0.64 metres, making it a modest but well-preserved specimen.

The site sits on undulating terrain where the ground to the south, southwest, and west is quite waterlogged, a detail that is far from incidental. Burnt mounds are almost always found near a reliable water source, and boggy or marshy ground of this kind would have supplied exactly what the process required. Just four metres to the southwest lies a possible barrow, a prehistoric burial mound, which raises the question of whether the two features are related in date or function, or simply neighbours across the centuries by coincidence. The proximity of the two monuments, each ambiguous in its own way, gives the site a layered quality that a casual glance across a green field would never suggest.