Cambrian Cave Registry

L:[59000] V:	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	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
SWCC; Descent 184, Nant Gam Choke
References
SWCC Newsletter 58, 1968 The End?
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
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
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Cambrian Cave Registry entry 360				© Cambrian Caving Council ⓗ