It is a fulacht fia, a type of ancient cooking or processing site found in enormous numbers across Ireland, typically dating to the Bronze Age. The defining feature is simple enough: a mound of burnt and shattered stone, discarded after repeated cycles of heating and plunging into water, accumulates in a crescent shape around a central trough. The opening of the horseshoe, here facing east-north-east and roughly six metres wide, marks where the working area once was.

This particular example measures just over fifteen metres north to south and a little over fourteen metres east to west, rising to a height of about 0.85 metres. Those are solid, respectable dimensions. The proximity to a natural spring is entirely typical of the form; reliable water was the whole point. Excavated examples elsewhere in Ireland have yielded troughs lined with timber or stone, occasionally with wooden vessels, and the burnt stone itself, fractured by thermal shock, is the most durable evidence of whatever repeated activity took place here. Whether that activity was primarily cooking meat, processing hides, bathing, or something else entirely remains one of the more pleasantly unresolved questions in Irish prehistory.