1. A subcircular enclosure, 21.3-24.4m in diameter, defined by a ditch with a slight external bank.
(source Os495card; SO00SW15)
J.Wiles 22.07.02

2. Remains of a round burial cairn situated within forestry on the edge of the summit of Twyn Gwersyllfa. The grass covered cairn is circular on plan and measures about 9.5m in diameter and up to 0.7m in height. The cairn was originally scheduled in 1961; however, the area covered by the original designation did not relate accurately to the remains on the ground. The monument also includes an item situated 150m to the SE and described as an earthwork. This feature comprises a subcircular shallow ditch and is of uncertain antiquity or function.
Source: Cadw Revised schedule description. F.Foster 13.07.2005