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

NGR: SN 86361 15882
432 m.asl

Powys , Northern Outcrop - Central (Penwyllt to Penderyn)
map using leaflet map:
Access 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
SSSI: 0930 Ogof Ffynnon Ddu-Pant Mawr (Mixed)

Brendan Marris

Gary Evans

Keith Ball on Geology of OFD

Geology of OFD 2 Top

Geology of OFD 2 Gnome

Geology of OFD 2 Salubrious
SWCC; Descent 184, Nant Gam Choke
SWCC Newsletter 58, 1968 The End?
SWCC Newsletter 100, pp.4-16, 1985 Northern Lights
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
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
Cambrian Cave Registry entry 360
© Cambrian Caving Council ⓗ