It is not the kind of structure that announces itself. The walls are roughly the same height and width as the field walls around it, between 0.8 and 1 metre in each dimension, and the whole thing measures only about 18 metres at its longest. What makes it worth pausing over is a detail in the south-east corner: a small subsidiary space, barely 2 metres across, tucked against the inner face of the main wall like a room within a room. There is also a narrow gap of just 0.6 metres at the south-southwest, which would have served as an entrance.

The structure is subrectangular to polygonal in plan, its interior level and slightly sunken relative to the surrounding ground, which rises naturally to the north and south. It does not appear on the Ordnance Survey's six-inch map of 1838, which is one of the more reliable indicators that it post-dates the earlier phases of field organisation in the area. By the 1930 edition of the same map series, it shows up as a roughly oval enclosure folded into the existing system of field boundaries, suggesting it had by then become simply part of the working landscape. An aerial photograph later confirmed its outline. The most plausible reading of the evidence is that this was a 19th-century stock enclosure, built to contain farm animals, with the small internal pen perhaps used to separate individual animals or lambs during seasonal work.