It is D-shaped in plan, just over two metres across and not quite two metres tall, and its walls curve inward and upward in the ancient technique known as corbelling, where each course of dry-laid stone projects slightly further than the one below until the courses eventually meet at the top without the need for mortar or timber. Structures built this way have a satisfying internal logic, each stone held in place partly by the weight of those above it. A small niche set into the wall, framed by a flat lintel stone, adds a domestic or ritual detail that raises questions the site does not quite answer.

The structure sits within a wider old field system, and the combination of the two is what gives the place its particular character. Field systems of this kind on the Corca Dhuibhne peninsula can be very old indeed, representing centuries of agricultural organisation laid out across the land and then gradually abandoned or absorbed into later patterns of farming. The corbelled building was documented by J. Cuppage in the 1986 Dingle Peninsula Archaeological Survey, a thorough regional survey of the area also known by its Irish name, Corca Dhuibhne, which covers the long finger of land stretching westward into the Atlantic in County Kerry. That survey catalogued a remarkable density of monuments, and this small structure was among them, modest in scale but precise in its construction.