Mynydd Carn-y-cefn
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 South Wales Valleys, 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 (hill), 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 Measures, Pennant Sandstone, a rock assigned to the Carboniferous Coal Measures, Upper Coal Measures. The flanks of the hill owe their steepness in part to the action of glacier, glacial ice during the succession of Quaternary glaciati ...
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