The spread measures roughly 14 metres by 13 metres, and it represents the remains of a fulacht fia, the term used for a type of prehistoric cooking or processing site found in great numbers across Ireland. The characteristic mound of fire-cracked stone and charcoal-blackened earth that these sites leave behind is easy to overlook from a distance, but what it marks is a place where people once heated water by dropping stones, made red-hot in a nearby fire, directly into a trough or pit.

What makes the Kilgilky site a little more interesting than a solitary find is that it belongs to a cluster. Two further fulachta fiadh have been recorded in the same immediate area, which is a pattern seen elsewhere in Ireland and may suggest that these locations were returned to repeatedly, perhaps seasonally, over long periods of Bronze Age activity. The now-dried pond to the south-west of the mound is a detail worth pausing over. Water access was not incidental to these sites; it was fundamental. The proximity of a former water source, even one reduced today to a hollow in the ground, connects the physical remains to the practical logic of how such places were used.