Marked as a building on the 1891 OS map, and probably the remains of a small beudy. It is a sub-rectangular structure on a W-facing slope, 5.5m N-S x 5m, with drystone walls up to 0.9m high and 0.7m thick. The structure is open to the W side. The N wall is only extant for 2m and is on ground sloping down to Llyn Cwmystradllyn reservoir. On its S side is an enclosure (NPRN 532519), which is perhaps the stack yard of the beudy, and also marked on the 1891 map.
Recorded as part of RCAHMW Uplands Initiative Project, W B Horton, H & H, 04/03/2013.