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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Pen Cerrig-calch ： ウィキペディア英語版 Pen Cerrig-calch Pen Cerrig-calch is a subsidiary summit of Waun Fach in the Black Mountains in the Brecon Beacons National Park in southern Powys, Wales. Its summit, at a height of 701m (2,300 ft), is marked by a trig point. The peak sits high above the River Usk valley as it narrows above the small town of Crickhowell.The views from here are wide ranging and extend as far as the Beacons themselves to the west. A ridge runs off to the northwest and the shoulder of Pen Gloch-y-pibwr then turns north to the secondary top of Pen Allt-mawr whose peak at 719m is also crowned by a trig point.〔Nuttall, John & Anne (1999). The Mountains of England & Wales - Volume 1: Wales (2nd edition ed.). Milnthorpe, Cumbria: Cicerone. ISBN 1-85284-304-7.〕 ==Geology== Like all of the hills in the Black Mountains, Pen Cerrig-calch is formed from mudstones and sandstones of the Old Red Sandstone laid down during the Devonian period but it is unusual in having a band of Carboniferous Limestone outcropping around the summit and giving rise to a few shakeholes. A classic example of an inlier, the name of the hill reflects this situation; it means 'top of the limestone rock' in Welsh. The actual summit itself is formed from pebbly sandstone of the Marros Group (formerly the Millstone Grit Series), which also dates from the Carboniferous period. The rounded southwestern shoulder of the hill ends abruptly at a cliff by the name of Darren (Welsh 'edge') which was formed by a sizeable landslip which most probably occurred in the early post-glacial period. A large area of hummocky ground abounding with boulders of Old Red Sandstone lies across the slopes below Darren.〔British Geological Survey 1:50,000 map sheet 214 'Talgarth' & 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）』 ■ウィキペディアで「Pen Cerrig-calch」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.