The slight rise in the pasture, the dark spread of material beneath the turf, these are the quiet remains of a fulacht fia, one of the most common yet persistently mysterious monument types in the Irish landscape.

A fulacht fia is, at its simplest, a prehistoric burnt mound, the accumulated debris of a cooking method that involved heating stones in a fire, dropping them into a water-filled trough, and bringing the water to a boil. The shattered, fire-cracked stones were raked out and piled nearby, and it is those discarded heaps that survive as the characteristic horseshoe-shaped or spread mounds seen across Ireland today. The monument at Shanakill fits the type closely: a grass-covered spread of burnt material in low-lying ground, positioned beside a natural spring, which would have supplied the water essential to the whole process. The association with running or standing water is almost universal among fulachta fia, and the spring here presumably drew people to this spot in the first place. When exactly is harder to say with precision, though the monument class is generally associated with the Bronze Age, broadly spanning from around 2000 to 500 BC.