Passage grave in Anglesey, Wales, under a cairn <50 metres in diameter. This tomb is linked to the Boyne culture by the decoration on the underside of the capstone; such decoration is rare outside Ireland, although it occurs on another Anglesey passage grave, at Barclodiad Y Gaw-res. Another distinctive feature of this tomb is the four concentric stone circles surrounding the chamber, the outer one surrounding the base of the cairn.
The Macmillan dictionary of archaeology, Ruth D. Whitehouse, 1983Copied