Cwm Dwr, Ogof Ffynnon Ddu Cwm Dwr Entrance, Cwm Dwr Quarry Cave, Cwmdwr Quarry Cave

NGR: SN 85738 15605
335 m.asl

Powys , Northern Outcrop - Central (Penwyllt to Penderyn)
map using leaflet map:
Access Current Access arrangements
Description See Ogof Ffynnon Ddu 1 for description relating to OFD as a whole.
History The cave was first found by quarrying and then explored by the Dragon Group in 1937. The cave was re-opened by SWCC in 1957. It as then a medium sized cave with about 900 metres of passage. Subsequent exploration led to it being connected to OFD II in 1966 by Clive Jones & SWCC.
SSSI: 0099 Ogof Ffynnon Ddu (Mixed) GCR: 553
SWCC nl 44, pp.12-13, 1963, Bill Birchenough, Cwm Dwr Jama [breaktrough; radio location; dye test]
See Ogof Ffynnon Ddu 1 for bibliography for OFD as a whole
Brendan Marris Caves of South Wales
BGS Archives: BCRA/201W/B/1b, 1938
Cambrian Cave Registry entry 339
© Cambrian Caving Council ⓗ 2017