Cambrian Cave Registry

L:46 V:	Siambri Ddu, Siambre Ddu, Black Cavern NGR: SO 25074 11516 396 m.asl Monmouthshire , Northern Outcrop - East (Morlais to Abergavenny)				map using leaflet map:
			Cave
Access	On the Blaenavon to Abergavenny road, take the Pwlldu road and park 0.5 miles from the turning. Walk for about 0.5 miles to a quarry, the entrance is in the old tram track above the limestone quarry.
Description	A 9m crawl leads to a very large and somewhat unstable chamber which is 36m long and 25m wide. The roof is in millstone grit.
History	CCC, 1967
Hydrology
Conservation	SSSI: 0057 Siambre Ddu (Mixed)	Biological records
Gallery
^{Brendan Marris} 2008	^{Mark Burkey} 2015
Survey
CCC (1967)
Wessex CC (1977)
References
Playford, P. (1967) The discovery of Black Cavern Pwll Ddu, CCC Jnl. 1 pp.12-14
Welsh Geological Quarterly, 4(1) pp.38-39, (1968), P.H.Playford, A cavern below the Millstone Grit near Abergavenny
BCRA Trans 1(3) p.150, Trevor M.Thomas, The South Wales Interstratal Karst (1974)
Davies, C.W. (1978) The Black Cavern, Pwll Ddu, Wessex CC Jnl.172 pp.41-46
Gascoine,W. (1982) Trans.BCRA 9(3), pp.165-175, The formation of black deposits in some caves in South East Wales
CKS 27(3),p.130, Owen Clarke, Conditions in caves and other karst features in the Pwll Du area at the time of the Namurian trangression
Brendan Marris Caves of South Wales
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Cambrian Cave Registry entry 857				© Caving Wales ⓗ Ogofa Cymru