A robbed out cairn lies on the spine of a low ridge on Bryn Pwllygerwn.
It is a turf-covered stony mound measuring 10m in diameter and 0.6m high. It is likely that both height and circumference of the mound have been added to by robbing spoil from a central crater 4m-5m across and 0.5m deep.
A bank resulting from a former intake of the Common impinges on the S side of the cairn and robbing spoil lies on top of the bank.
David Leighton, RCAHMW, 16 November 1992
Adnoddau
LawrlwythoMathFfynhonnellDisgrifiadapplication/pdfThe Western Brecon Beacons Publication CollectionPlan of the Upper Usk valley showing the antiquity of land-use, as published in the RCAHMW publication The Western Brecon Beacons, figure 16.