A large round cairn on the edge of a forestry plantation at 333m above OD on the summit of Mynydd y Grug. It measures 25m in diameter and 2.5m high. A central depression measures 4m across and 1.3m deep.
Trees have been planted up to the mound edge and there is now no trace of the surrounding ditch.
Additional source:
OS record card: ST19SE1
David Leighton, RCAHMW, October 1991
Adnoddau
LawrlwythoMathFfynhonnellDisgrifiad
application/pdfAWP - Archaeology Wales Project ArchivesArchaeology Wales report from an archaeological watching brief at Tyle Crwth, Ystrad Mynach, consisting of record sheets. Project No. P2586.