The site at Killeen came to light in 1996, when land reclamation works in a flat, damp field turned up a surface spread of burnt material measuring roughly six metres north to south and four metres east to west. It sits directly on the stream bank, which is precisely where you would expect to find it.

Fulachtaí fia, the Irish term commonly used for these features, are among the most widespread prehistoric monument types on the island. The working interpretation is that they functioned as cooking or heating sites: a trough was dug close to a water source, filled, and then heated by dropping fire-cracked stones into it repeatedly. The discarded, shattered stone accumulated over time into the characteristic mound of dark, burnt material that survives today. The Killeen example is not an isolated one. It forms part of a linear cluster of similar monuments distributed along the course of the Fiddaunglass stream, with another burnt mound recorded just 53 metres to the south. The grouping along a single watercourse suggests repeated, perhaps sustained, use of this particular stretch of ground over time, though whether these sites were in use simultaneously or represent activity across separate periods is difficult to say without excavation.