The spread measures roughly twenty metres north to south and eighteen metres east to west, a modest but clear footprint of burnt material turned up by agricultural activity over the years.

A fulacht fia is a type of ancient cooking site found in enormous numbers across Ireland, typically dating from the Bronze Age, though some examples span a wider period. The usual form involves a trough dug into the ground, often lined with wood or stone, which was filled with water and heated by dropping fire-cracked stones into it. Those stones, once used and fractured by the repeated thermal shock, were piled at the edges of the trough, gradually forming the characteristic horseshoe-shaped mound of blackened, broken material that survives at many sites today. At Kilmore, the burnt spread visible in the field is the remnant of exactly this kind of accumulated debris. The south-facing slope and proximity to the Sall River valley are typical of fulacht fia placement; access to a reliable water source was a practical necessity for the site to function at all.