The Harold Stone, Skomer Island, c.1910

The Harold Stone is an erect monolith, 1.7m high by 0.8m by 0.5m. It tapers from a broad base to a point, with its edges aligned nearly north-south; its wide face is orientated to face the sea to the east and the island to the west.
Although the Harold Stone on Skomer is currently undated, excavations at other similar stones in Pembrokeshire have always yielded a prehistoric, or Bronze Age, date. It is therefore safe to assume that this stone is also a Bronze Age monument, marking a burial (in a cremation urn) or an area of now concealed ritual and funerary activity.