The site, measuring roughly 17 metres by 8 metres, came to light during archaeological testing ahead of the construction of the N8 Rathcormac-Fermoy Bypass and was fully excavated in 2003. What it turned out to be was a fulacht fia, a type of prehistoric cooking or processing site found in large numbers across Ireland, typically consisting of a mound of heat-shattered stones accumulated over repeated use, alongside a water trough and a hearth. The stones would have been heated in a fire and then dropped into a water-filled trough to bring the water to a boil; the cracked and spent stones were then discarded to the side, building up the characteristic mound over time.

At Corrin, the stone spread partially overlay a subrectangular unlined trough cut into the ground, measuring roughly 2.6 metres north to south and just over a metre east to west, with a depth of about half a metre. Unlined troughs like this, dug directly into the earth rather than reinforced with timber or stone, are a known variant of the type. The site sat approximately 60 metres west of the Shanowennadrimina Stream, a proximity that makes practical sense: a reliable water source was essential to the whole operation. Excavators also recorded three pits, a post-hole, and four stake-holes near the trough, suggesting some form of associated structure or activity, though their precise function was not determined. The charcoal-enriched soil throughout the spread confirms repeated burning in the vicinity over what was likely a sustained period of use, though no specific dates were published in the available record.