The mutilated ruins of a cairn stand upon a saddle between two mountains at the head of Cwm-llwyd. It is near circular, some 18-19.5m across and survives up to 1.2m high. It is crossed by a comparatively recent sheep shelter wall. The cairn was dug into in 1851, when a cist or slab chamber, 0.9m by 0.7m and 0.5m deep was uncovered. This contained fragments of human bone and had been covered by a 2.0m by 0.9m capstone. In 1851 'sheperd-huts' were observed around the base of the cairn. The cairn was already robbed. The shelter wall is built over the displaced capstone and so must post-date the excavation.

Source: Wynne foulkes in Archaeologia Cambrensis New Series III (1852), 96-9

John Wiles, RCAHMW, 22 February 2008