Substantial natural outcrop, lying some 140m west of Bryn Celli Ddu tomb (NPRN 93827) and 130m north of a standing stone (NPRN 302503). The outcrop has up to 28 cupmarks on its surface, clustered into different groups. Identified by George Nash and a team from the University of Bristol.

See: Nash et. al. 2005, Archaeology in Wales 45, pp. 11-16.

T. Driver, RCAHMW, 25th Jan 2012.