Video: The Geology of Ogof Ffynnon Ddu

Learn about the geological features of Wales’ Ogof Ffynnon Ddu National Nature Reserve with Dr. Keith Ball, a retired British Geological Survey geologist and life-long speleologist.

The first of four instruction videos on the subject, the film, produced by Antonia and Andy Freem, introduces the main features and rock types.

[via YouTube]