A building platform is located on the north-east facing slopes of Gelligaer Common. Its terrace measures 7.5m long (north-east by south-west) by 5m wide, is cut back to form a hood 0.6m deep and the terrace is built out to 0.6m high. The interior is stony below shallow turf. The corners of the lower end of terrace are slightly raised.
Additional sources:
A Fox, Archaeologia Cambrensis 94 (1939), 180 & 195.
OS record card: SO1SW20.
RCAHMW, Glamorgan Inventory vol.3 part 2 (1982), 30 (PH43).
RCAHMW air photos: 945106/51.

David Leighton, RCAHMW, 11 May 2016