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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 Mynydd Bach Trecastell ： ウィキペディア英語版 Mynydd Bach Trecastell Mynydd Bach Trecastell is a hill on the border between the counties of Carmarthenshire and Powys in southwest Wales. It lies within the Black Mountain (range) of the Brecon Beacons National Park and Fforest Fawr Geopark. Its summit is plateau-like and reaches a height of 412m at OS grid ref SN 827312 at Y Pigwn. The name signifies the 'little hill of castle town'.〔Ordnance Survey Explorer map OL12 'Brecon Beacons National Park: western area'〕 ==Geology== The summit of the hill is formed in sandstones and siltstones of the Cae'r Mynach Formation which like all of the rocks are tilted steeply to the southeast as part of a geological structure called the Myddfai Steep Belt. The flaggy micaceous sandstones of the Tilestones Formation immediately overlies these beds and this is followed in turn by the thick sequence of the Raglan Mudstone Formation. These latter two formations are assigned as the oldest parts of the Old Red Sandstone though date from the Silurian period. To the northwest are the various sandstones, mudstones and siltstones of the Aberedw, Hafod Fawr, Cwm Graig Ddu and Halfway Farm Formations. A series of northwest to southeast aligned faults cut through this succession and give rise to minor features in the landscape.〔British Geological Survey 1:50,000 map sheet 213 '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）』 ■ウィキペディアで「Mynydd Bach Trecastell」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.