A wedge tomb is a type of megalithic burial monument common in the west of Ireland, characterised by a stone-lined chamber that narrows and lowers from one end to the other, the whole typically enclosed within a mound. This one tapers from west to east, its chamber running roughly 2.95 metres in length, wide and relatively tall at the western end and noticeably lower and narrower at the eastern end. A surviving portion of the roofstone still rests across the western end, supported by the two long sidestones and steadied by a small packing stone placed on top of the northern slab. The eastern portion of the roofstone is broken away, and loose fragments on the chamber floor may be its remains.

When the antiquarian John O'Donovan visited in 1839, he noted three such monuments in the same field, one of them already fallen flat. Thomas Johnson Westropp returned later in the century and described this particular example as a fine cromlech, remarking on what he called a curious angular gap in the west slab, and recording its dimensions, though he later revised his initial measurement of the length. By 1907 he was including it in what he called the Reabachan Group of Dolmens and judging it perfect. The monument sits within a broader landscape that has since proved extraordinary in its own right. The Roughan Hill group, spread across the townlands of Parknabinnia, Leana, Caherfadda, and Commons North, has been identified as the densest concentration of wedge tombs anywhere in Ireland. Excavations at nearby tombs have confirmed that the monuments in this area were constructed during the Chalcolithic period and into the Early Bronze Age, placing their origins roughly at the transition between the late Neolithic and the age of metalworking. Surrounding the tombs are the remains of contemporary farmsteads, enclosed habitation sites defined by mound walls, some lying within 200 metres of one another, suggesting that this was once a settled, working agricultural landscape rather than a ceremonial wilderness.