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Cefn yr Ystrad : ウィキペディア英語版 | Cefn yr Ystrad
Cefn yr Ystrad is a mountain in the Brecon Beacons National Park in Wales. It is an outlier of the Central Beacons group.〔Nuttall, John & Anne (1999). The Mountains of England & Wales - Volume 1: Wales (2nd edition ed.). Milnthorpe, Cumbria: Cicerone. ISBN 1-85284-304-7.〕 The broad northeast - southwest aligned ridge reaches an elevation of . One of the southernmost peaks in the Brecon Beacons, it rises to the east of Pontsticill Reservoir. The summit area is a great stretch of wild moorland, with the highest point marked by a trig point. ==Geology== The hill is formed from successive layers of Carboniferous Limestone and the overlying Twrch Sandstone (formerly known as the ''Basal Grit'' of the Millstone Grit). There are extensive ice-smoothed pavements of the latter and loose rock abounds. The crest and southern slopes of the hill are home to dozens of shakeholes, some of which reach considerable proportions.〔British Geological Survey 1:50K map sheets 231 ''Merthyr Tydfil'' and 232 ''Abergavenny''〕
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