Drystone construction, where stones are laid without mortar and held in place by their own weight and careful arrangement, was the default method for field enclosure across much of the west of Ireland, and these walls at Cappagh are broadly typical of that tradition. What makes the site worth pausing over is precisely its ordinariness: this is not a monument or a ruin in the dramatic sense, but a working pattern, laid down across generations and still largely readable.

The field system appears on the Ordnance Survey six-inch map of 1916, which gives a useful lower boundary for dating the arrangement as it existed in the early twentieth century. The walls themselves are thought to belong to the eighteenth, nineteenth, or early twentieth century, placing them within a period of significant agricultural reorganisation in rural Ireland, when enclosure and the formalisation of landholding reshaped townlands across the country. At the centre of the site, near a cluster of derelict farm buildings, a number of the walls have collapsed and fallen out of use. This concentration of decay around the abandoned buildings is telling: where the human activity ceased, the structures that depended on it followed.