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The Geology of Ogof Ffynnon Ddu

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Rolf:
"This is the first of 4 instructional videos describing and explaining the geological features of the above and below ground landscapes in the OFD Nationl Nature Reserve in the central Brecon Beacons. This video introduces the main features and rock types. The presenter is Dr Keith Ball, retired from the British Geological Survey and also a life-long speleologist. The films will be published progressively over the next few weeks."

more:

https://www.youtube.com/watch?v=Wx_XtDLcWeU

Rolf:
"This video follows on from the surface geology presented in Part1. The upper passages in OFD2 are the oldest in this huge cave system and this video explains their geological context, some of the evidence of their age and modes of formation. Part 3 will continue deeper into the system to some of the younger passages . The Presenter is Dr Keith Ball."

https://www.youtube.com/watch?v=pOYLkt5Efww

Rolf:
"The Geology of Ogof Ffynnon Ddu Part 3

The video records a detailed examination and explanation of the geological characteritics of Gnome and Chasm Passage in the penultimate part of this instructional series."

https://www.youtube.com/watch?v=nelqIcubxAw

Edit: korrigert skrivefeil

Rolf:
"This is the last of the set of 4 films and presents the geology of Ogof Ffynnon Ddu's lowest passages immediately above and along the main stream passage. Many of the key questions that cavers ask about the peculiar features of these very black limestones are discussed."

https://www.youtube.com/watch?v=ltTAdVgRo2Q

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