OAN field survey, located by GPS to an accuracy of +/- 1m. A small denuded circular earthwork located on the front edge of a shelf in the bedrock on the side of Creigiau Eglwyseg. It is of approximately 6m diameter by 0.3m-0.4m high, and is slightly more pronounced on the south side. There is a slight central depression and no apparent stone in the build. 2002/06/12/OAN/PJS