Nothing marks the surface now, and there is no visible trace from ground level.

What the plough disturbed is almost certainly a burnt mound, a type of prehistoric site found widely across Ireland and Britain. The typical interpretation is that these were cooking places, where stones were heated in a fire and then dropped into a water-filled trough to bring it to the boil. The repeated heating and quenching cracked the stones, and over time the shattered, fire-reddened fragments accumulated into a distinctive mound alongside the blackened, charcoal-rich soil that is their most reliable calling card. The proximity to a spring well at Coan fits the pattern precisely; burnt mounds are almost always found beside a reliable water source, whether a stream, a boggy hollow, or a natural spring. They date most commonly to the Bronze Age, roughly 2000 to 500 BC, though some have produced later dates. The site at Coan came to light through a local report rather than any formal excavation, and the full extent of what lies below the field surface remains unknown.