Nobody is quite sure what it was for. Its date is unknown, and the structure does not appear on either the 1838 or 1922 Ordnance Survey six-inch maps, which rules out nothing in particular but does suggest it was either already ruinous or simply unremarked by those surveyors.

The enclosure measures roughly 43 metres along its longer axis and between 18 and 24 metres across. The curved perimeter on the landward side is made up of a loose, tumbled concentration of medium and large stone slabs, some prostrate and overlapping, others set upright. The clearest section runs along the south and south-west, where a single row of close-set, low upright slabs forms a discernible arc. Inside, the ground is strewn with stones that do not resolve into any obvious plan, though there are traces of what might be a bisecting wall running through the interior, visible as a low, broken line of stones arranged in a domino-like pattern, their long axes parallel to one another and at right angles to the direction of the wall itself. Whether this represents a deliberate internal division or simply collapsed material is not clear. Immediately to the north, a midden, the accumulated debris of past habitation or activity, is exposed at the cliff edge, hinting that people were certainly present here at some point, working, eating, or sheltering close to this stretch of shoreline.