Close to the edge of the low rocky cliff face formed by an outcrop band lies a ruined sub-divided rectangular building. Overall it measures 10m (NW-SE) by 4.4m. A cross-wall lies at 3.5m from SE end. Walls are of tumbled slabs and blocks, perhaps 0.6m thick originally. There is an entrance gap in the SW wall of the larger (N) compartment.
