On the south-east-facing slopes of Rossmackowen Commons in County Cork, generations of cutting away the bog have gradually exposed something that had been quietly preserved beneath it: a network of stone field boundaries belonging to a landscape that predates the bog itself. The walls emerge intermittently across a roughly rectangular area measuring around 750 metres from north-west to south-east and about 400 metres across, their low profiles protruding just above the surface of the remaining shallow peat. They are collapsed for the most part, but many of their stones still stand upright, set at right angles to the line of the wall, which is a construction method sometimes seen in early field systems. The walls are mainly curvilinear rather than straight-sided, and they occasionally continue into areas of deeper, uncut bog where whatever lies beneath remains unseen.

What makes this site more than a curiosity of agricultural archaeology is the broader settlement picture it suggests. Within the same field boundary network there are five cairns, stone mounds that in Irish prehistoric contexts often mark burial sites, and five hut sites, the footprints of small dwellings whose occupants once worked this hillside when it was open ground rather than blanket bog. The bog itself, which formed over the landscape and sealed these features beneath it, acted as an inadvertent archive, preserving wall lines, cairns, and the traces of habitation together in something close to their original arrangement. The field boundaries reach a maximum thickness of around 0.6 metres and stand between 0.1 and 0.35 metres above the present surface, modest dimensions that nonetheless carry a considerable amount of information about how this ground was once organised and used.