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Fan Bwlch Chwyth
Fan Bwlch Chwyth is a peak in the Fforest Fawr section of the Brecon Beacons National Park and within the county of Powys.
Its summit (at 603 m) is marked by a trig point at OS grid ref SN 912217.〔Ordnance Survey Explorer map OL12 'Brecon Beacons National Park: western area'〕
== Geology ==
The hill is formed from sandstones and mudstones of the Senni Beds Formation and Brownstones Formation of the Old Red Sandstone laid down during the Devonian period. A north-northwest - south-southeast trending fault runs across its north-eastern face.
This face is much the steepest and has its origins in the ice ages when a minor glacier grew at this spot. It has left a couple of arcuate moraines which are readily seen from the track. The glaciated rock face has been quarried. The quarry is designated as a site of special scientific interest for its geological interest.〔British Geological Survey 1:50,000 map sheet 231 'Brecon' & accompanying sheet explanation〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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