A steady cascade. Sgwd Ddwli Uchaf on the Afon Nedd Fechan

Virtually all of the falls occur on tributaries of the River Neath occupying valleys that have been deeply incised into the landscape. It is suggested that overdeepening of the Vale of Neath by glacier ice lowering sea levels during the succession of ice ages has resulted in these tributaries cutting down into their own beds as they adjust to a base level lower than in pre-glacial times. The underlying geology is a generally southerly dipping succession of Carboniferous age sandstones and mudstones assigned by geologists to the Marros Group and formerly referred to as the Millstone Grit Series. Preferential erosion, whereby the less resistant mudstones have been more readily removed by the passage of water, often following various forms of weathering, has left sandstones forming the lips of the falls. The siting of individual falls is closely linked in many cases to the presence of northwest–southeast–aligned faults that have brought different lithologies into proximity

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Tags: Wales River Uk Landscape photography Waterfall Trees Green Sandstone Geology Powys Waterfall country Landscape and travel Brecon beacons national park Pontneddfechan No people Arvor Photography Daryl Hutchinson Sgwd ddwli uchaf 2017 Brecknockshire Carboniferous Age Marros Group Afon Nedd Fechan

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