These features, known as fulachta fia, are among the most commonly recorded prehistoric monuments in the country, yet they remain largely invisible to anyone who does not know what to look for. The typical form is a horseshoe-shaped mound of shattered and heat-fractured stone, usually surrounding a trough that would originally have been lined with wood or clay. The process involved heating stones in a nearby fire and dropping them into a water-filled trough until the water boiled, a method efficient enough to cook large joints of meat and one that has been successfully replicated by experimental archaeologists.

Fulachta fia date predominantly to the Bronze Age, roughly 1500 to 500 BC, though some examples have yielded earlier or later dates. They are almost always found close to a water source, whether a stream, a spring, or marshy ground, and Kerry's wet, boggy terrain has preserved a considerable number of them. The shattered stone that forms the mound is the direct physical evidence of repeated heating and rapid cooling; a stone used in this way cracks and splinters after a handful of uses and must be discarded, which is why the mounds can accumulate to a substantial size over time. Whether they served purely as cooking sites, or also as places for bathing, textile processing, or communal gathering, remains a matter of ongoing debate among archaeologists. Kilfallinga itself is a small rural townland, and the presence of a fulacht fia there fits a broader pattern of Bronze Age activity distributed through the Kerry countryside, much of it still only partially understood.