Pen Pumlumon Arwystli II is the middle one of three large Bronze Age stone cairns on top of Pen Pumlumon Arwystli (see also Nprn 304829 and 304831). It is a sub-circular cairn, 23m by 20m and c.1.6m high, which has had shelters constructed upon it.
The cairn is still substantially intact, but a shelter has been built on the south from the cairn stone, and on top are traces of a round stone platform c.1-1.5m in diameter with a shelter to its north - burnt stone is visible in the bottom of the shelter. The round platform and burnt stone may be related to use as a beacon.

Sources:
Os495card; SN88NW2)
RCAHMW AP955039/68-70
Cadw SAM Description, 1988.

J.Wiles 15.04.02