Measuring roughly four metres north to south and three metres east to west, it retains walls standing to about a metre in height, yet nowhere along its perimeter is there a clear entrance. That absence is what makes it genuinely puzzling. Without a doorway, the structure may never have sheltered people at all; the leading interpretation is that it served as an animal enclosure, a stone pen for the upland sheep that still graze the rough ground around it today.

Built on an alignment running north to south, the structure has a semi-circular extension of around two metres attached to its northern end, though that addition is more ruinous than the main body of the walls. The purpose of this annexe is unclear, but its presence suggests the site was adapted or expanded at some point, perhaps to suit changing needs. Around ten metres further north, another large hut site sits on the same exposed hillside, hinting that this was never an isolated building but part of a small cluster of structures making use of the same sheltered terrace. Whether these were contemporary or separated by generations of use, the stonework does not say.