Coed-y-Glyn Burial Chamber is a Neolithic megalithic monument. The remains of the burial chamber are on a gentle south-east facing slope at the edge of a limestone terrace. The construction is unusual as the capstone appears to have been levered from the bedrock and propped up by low stones at its outer edge. The capstone has broken into three pieces and rests above a partially collapsed chamber. The capstone measures about 4.6m long, up to 2.8m wide and 0.8m thick. The remains of the covering mound measure about 14m in diameter.

Source: Cadw scheduling description of August 2006.
F.Foster, RCAHMW, 08.09.2006.

Bones and other unspecified relics were found in the nineteenth century. It is uncertain whether the chamber would have been covered by a mound or cairn.

Sources: RCAHM Anglesey Inventory (1937), 48
Lynch 'Prehistoric Anglesey' (1937), 55 fig 22