Nant Glais Caves
Geology & landscape
Geological Feature: Cave / Cavern, Gorge / Ravine · Geological Period: Carboniferous · Rock Type: Carboniferous Limestone, Limestone
Landscape processes: Fluvial, Karst
Description
Description The site covers the limestone gorge of the Nant Glais and two vadose cave systems which lie parallel to it and under each bank. Both caves are formed at the contact of the oolitic and dolomitic facies within the Carboniferous Limestone and the contrasting solutional properties of the two lithologies have spectacularly influenced the passage morphology. The caves are also important for their unusually large populations of white trout. Remarks: The site is within the Brecon Beacons National Park and is in part a Glamorgan Trust for Nature Conservation Reserve.