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Mynydd Carn-y-cefn () is the name given to the broad ridge of high ground between the Ebbw Vale and the valley of the Ebbw Fach in the Valleys region of South Wales. It lies within the unitary area of Blaenau Gwent, formerly Monmouthshire. The broad-topped ridge runs NNW-SSE and achieves a summit height of at a point crowned by a trig point at OS grid ref SO 187084 between Ebbw Vale and Blaina. It is a Marilyn with a prominence of 176 metres. ==Geology== The entire hill is composed of sandstones and mudstones dating from the Carboniferous Period. There are also numerous coal seams within the sequence, most of which have been worked. The upper part of the hill including the summit plateau is formed from the Pennant Sandstone, a rock assigned to the Carboniferous Upper Coal Measures.〔British Geological Survey 1:50,000 scale map sheet no 232 ''Abergavenny''〕 The flanks of the hill owe their steepness in part to the action of glacial ice during the succession of ice ages. There are also 3 other hills surrounding Mynydd Carn-Y-Cefn which are Coity Mountain and the Mulfran. You can also see Pen-Y-Fan from the summit. There are numerous landslips on the flanks of the ridge, notably above Blaina. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mynydd Carn-y-cefn」の詳細全文を読む スポンサード リンク
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