It belongs to a category of monument found in the hundreds across Ireland: the fulacht fia, a type of ancient cooking or processing site typically identified by a mound of fire-cracked stone and charcoal left behind after repeated heating of water in a trough. The usual method involved heating stones in a fire and dropping them into a water-filled pit until the contents boiled, and the discarded, shattered stones built up over time into the low, often horseshoe-shaped mounds still visible in fields and bogland today.

The site at Aglish is modest in what is known about it. A spread of burnt material has been observed in the pasture to the east of a local stream, but its full extent has not been determined. The proximity to water is consistent with how these sites tend to be positioned; access to a reliable water source was a practical necessity for whatever activities took place there. Fulachtaí fia are generally dated to the Bronze Age, though some continued in use into later periods, and their precise function remains a subject of debate among archaeologists, with proposals ranging from cooking large quantities of meat to use in textile processing or bathing.