The site consists of the remains of two
granite cross-shaft fragments dating from the 9th–11th century, and an underground passage and cross-shaped chamber below the crosses, thought to be either the remains of
tin workings or a possible
oratory. The northern cross, the Doniert Stone, is high with panels of
interlace decoration on three sides and inscription '''' carved in
half uncial or
insular script. The inscription is thought to refer to the local ruler Dumgarth (or Dwingarth), who is recorded in the early Welsh chronicle known as the '''' as having drowned in around 875 AD. The southern cross, sometimes referred to as the Other Half Stone, is high with a panel of interlace decoration on the east face, a broken mortise slot at the top and a plinth at the bottom. ==Excavations==