The three cairns upon the summit of Foel-Cwmcerwyn are:
II (B) - measuring 300' in circumference and 2.2m high; upon excavation a cist containing an inverted urn cremation was revealed.
III and IV (C and D) - measuring 180' and 120' in circumference, 4' and 2' high, respectively. Nothing was found upon opening III and IV.

(source Os495card; SN03SE12)
J.Wiles 15.03.02