Porth yr Ogof Caving in Porth yr Ogof,

Porth yr Ogof Caving

Category : Caving
Address :
Porth yr Ogof



Telephone :
Fax :
Website : www.brecon-beacons.com/porth-yr-ogof.htm

This southern edge of the Brecon Beacons National Park contains a belt of carboniferous limestone wedged between Old Red sandstone to the north and the Millstone Grit containing coal deposits to the south. One of the characteristics of carboniferous limestone is that it is susceptible to the action of slightly acidic water. Rain falling in this locality absorbs carbon monoxide from the air thus creating a mild solution of carbonic acid. As this slightly acidic water passes through the naturally occurring cracks and fissures in the carboniferous limestone over geological time it has created the extensive cave systems found along this southern edge of the Brecon Beacons National Park.

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