above the extreme E7-grade. Filmography Documentary: Bibliography North Wales Classics (Jack Geldard), 2010, Rockfax. . North Wales Climbs (Mark Reeves, Jack Geldard, Mark Glaister), 2013, Rockfax. . The Black Cliff: The history of rock climbing on Clogwyn du'r Arddu (Peter Crew, Jack Soper, Ken Wilson), 1971, Kaye & Ward . See also Clogwyn railway station Dinas Cromlech, a mountain crag at Llanberis pass Dinorwic quarry, a slate climbing area near Llanberis History of rock climbing References Further reading External links Clogwyn Du'r Arddu (Cloggy), UKClimbing Crag Guide (2022) Clogwyn Du'r Arddu (Cloggy), PlanetMountain Crag Guide (2022) Betws Garmon Llanberis Cliffs of Gwynedd Cliffs of Snowdonia Rock formations of Gwynedd Rock formations of Snowdonia Climbing areas of Wales