It is easy to overlook, and for a long time it was. The deposit measures roughly eleven and a half metres by ten, a modest spread of charcoal-rich soil mixed with heat-shattered stone that speaks, in its understated way, to a very old kind of activity.

What was uncovered here belongs to a category of site known as a burnt mound, one of the most common yet least glamorous features of the Irish prehistoric landscape. Burnt mounds are generally interpreted as the debris from a cooking or heating process in which stones were repeatedly fired and then plunged into water-filled troughs to raise the temperature. The stones, unable to withstand the thermal shock, fracture and darken, and over time the discarded fragments accumulate into the kind of low, kidney-shaped or circular spreads that archaeologists recognise across Ireland and Britain. The Garryhesty example came to light not through deliberate excavation but through licensed archaeological monitoring carried out during quarry development under planning reference 05/2452, a reminder that infrastructure work, when properly supervised, can surface things that would otherwise remain buried. The monitoring was logged under reference 20E0382ext.