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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 Myddfai ： ウィキペディア英語版 Mynydd Myddfai Mynydd Myddfai is a hill 4.5 miles southeast of Llandovery in the county of Carmarthenshire, southwest Wales. It lies within the Brecon Beacons National Park and Fforest Fawr Geopark. The hill is in the form of a broad ridge aligned southwest to northeast with three or four distinct tops separated by cols. The northwest side drops steeply away towards the village of Myddfai whilst the other side is a more shallow slope down towards Glasfynydd Forest which encircles Usk Reservoir. The plateau surface of the hill rises to a height of 440m at OS grid ref SN 806297 where a trig point has been erected.〔Ordnance Survey Explorer map OL12 'Brecon Beacons National Park: western area'〕 ==Geology== The hill is composed of a variety of different rock formations all tilted steeply to the southeast in a structure known as the Myddfai Steep Belt. The summit ridge is formed from sandstones and mudstones of the Cae'r Mynach Formation. Immediately southeast of these beds is the narrow band of the Tilestones Formation along which are a line of grassed over diggings left after these flaggy micaceous sandstones were extracted for use as roof tiles. Southeast again is the thick sequence of the Raglan Mudstone Formation.These last two formations are considered to be the lowermost of the Old Red Sandstone sequence though assigned like the rest of the rocks forming Mynydd Myddfai to the Silurian period. Northwest of the summit ridge are the sandstones and siltstones of the Hafod Fawr Formation and beneath them more sandstones, mudstones and siltstones of the Cwm Craig Ddu and Halfway Farm Formations. Northwest to southeast oriented faults cross the ridge in places and can be seen where they offset the line of the Tilestones workings.〔British Geological Survey 1:50,000 map sheets 212 'Llandovery' & 213 'Brecon' & accompanying sheet explanations〕 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 Myddfai」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.