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Top Entrance, Ogof Nos Hir, OFD2, OFD 2, OFD Top Entrance, Ogof Ffynnon Ddu Top Entrance


NGR: SN 86357 15878
433 m.asl

Powys , Northern Outcrop - Central (Penwyllt to Penderyn)
 map using leaflet map:
Cave
Access See caving.wales for current Access arrangements
Description This entrance leads to a well decorated complex upper series from which several other sections of the cave lead off. Called Clay series originally, though this now tends to be called OFD2.
History SWCC opened this entrance in 1967
Hydrology
Conservation SSSI: 0930 Ogof Ffynnon Ddu-Pant Mawr (Mixed)
Gallery

Brendan Marris
2008
Gary Evans
2020


Keith Ball on Geology of OFD


Geology of OFD 2 Top


Geology of OFD 2 Gnome


Geology of OFD 2 Salubrious
Survey
Cwmbran CC, 1967 Ogof Ffynnon Ddu II, Cwmbran Caving Club Extensions
Imperial College CC, 1967. Part of Clay Series, in LUCC Jnl 5
SWCC; Descent 184, Nant Gam Choke
References
Cwmbran CC Jnl. 1 pp.21-23 1967 [discovery of Nyth Bran and White Arch via new entrance]
London Universities Caving Clubs Journal 5, pp.11-19. 1968 O.F.D. II, J,Winterhalder and A.C.Waltham
SWCC Newsletter 58, 1968 The End?
SWCC Newsletter 67, 1970 Mel Davies, A new explanation for the soft calcite in Ogof Ffynnon Ddu [glacial sole precipitation]
SWCC Newsletter 100, pp.4-16, 1985 Northern Lights
Selected Caves of Britain and Ireland, 1997
CS 12(1),p.20, P.L.Smart; N.Chrisopher, Cave development Ogof Ffynnon Ddu
CS 13(2),p.67, Owen Clarke, Relationships between surface geomorphology and speleogenesis in South Wales [Cretaceous age?]
CKS 27(3),p.130, Owen Clarke, Generally disregarded patterns in mud floors in caves
Descent 184, 2005, p15, The Nant Gam Extension
Chelsea SS nl.52(1), pp.11-13 (2010) Tom Foord, OFD Flood Pulse - 21st November 2009
CKS 33(2),p.90, Owen Clarke, Bouma patterns: The downtrodden cave mud floor formation
Descent 200, pp.36-40, Clive Westlake, Opening Top Entrance
Brendan Marris Caves of South Wales
Catalogue of Speleological Sites...between...A4067...Pant Mawr Moor, Gary Evans (2021),p.67
Search for further records Browse registry map
Cambrian Cave Registry entry 360
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