Lying at the foot of an eroded band of outcrop, overall dimensions are 12.7m (NW-SE) by 5.3m. Walls are of coursed blocks and slabs 1m thick and up to 1.1m high (in the SW corner), otherwise largely tumbled. The W end of the N wall incorporates an earthfast boulder. The SE end wall is built on platform of boulders, probably natural. The entrance was probably half-way along the S side. The interior is overgrown with grass and rushes.
