The burnt material is deep enough that a drainage ditch cut along the northern and eastern sides of the mound exposes a full metre of it in cross-section, offering an accidental window into the layers of repeated use that built the site up over time.

A fulacht fia is a type of prehistoric cooking or heating site found in enormous numbers across Ireland, particularly in low-lying or waterlogged ground. The typical arrangement involved a trough, often timber-lined, filled with water, which was then heated by dropping stones that had been fired in a nearby hearth. The stones crack and shatter with thermal shock, and it is this accumulation of fire-reddened and blackened fragments that forms the characteristic horseshoe-shaped mound still visible at so many sites. The Pluckanes example sits within a landscape that holds at least one near neighbour: a second fulacht fiadh of the same type lies roughly a hundred metres to the east, suggesting this was not an isolated episode of activity but part of a broader pattern of use across the area. Such clustering is not unusual; similar groupings appear throughout Cork and the wider Munster region, where the combination of wet ground and open grazing land provided ideal conditions for this kind of site to form and, crucially, to survive.