What lies beneath is the remains of a fulacht fia, a type of prehistoric cooking site found in extraordinary numbers across Ireland, typically Bronze Age in date. The basic principle was straightforward: a trough, usually timber-lined or stone-lined, was filled with water and heated by dropping fire-cracked stones into it. Those shattered, blackened stones, discarded repeatedly over time, are what built up the characteristic horseshoe-shaped mound that survives to this day.

What makes the Knockastuckane site quietly remarkable is not any single feature but rather its company. Within roughly forty metres to the south, two further fulachtaí fia have been recorded, sitting in the same pasture land. This kind of clustering is known elsewhere in Ireland and suggests that a particular spot, perhaps near a reliable water source or on well-drained ground beside a stream, was returned to repeatedly, possibly over generations. The three sites together hint at a small prehistoric landscape of activity that has since been absorbed entirely into ordinary farmland, invisible except to those who know to look for the gentle humps in the grass.