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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 Arfon Group ： ウィキペディア英語版 Arfon Group The Arfon Group is a stratigraphically defined geological group of rocks that are present in the Cymru Terrane around Bangor in North Wales, United Kingdom. The group contains volcanogenic conglomeratic sandstone, fine-grained tuffite and tuffaceous sediment. 〔http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=ARN〕 == Lithology and outcrop == This Precambrian volcano-sedimentary group incorporates over 4000 m of deposits and were previously considered to be of Cambrian age. Uranium–lead (U–Pb) isotope ratio data suggests that the whole succession is indeed Precambrian Neoproterozoic age. 〔A. J. Reedman, B. E. Leveridge, R. B. Evans, ''The Arfon Group (Arvonian) of North Wales.'', 1984, ''Proceedings of the Geologists Association'', 95, 313-321〕 Exposure of the lower unit (Padarn Tuff) is exhibited on a ridge between Bangor and Caernarfon (both located in North Wales) and also on a ridge near Llyn Padarn.〔P. J. Brenchley, P. F. Rawson ''The Geology of England and Wales'', 2006, 2nd Ed〕 This is noted to be a thick sequence of acid ash flow tuffs and exhibits welding and are thought to be rapid deposition of thin air-fall tuffs and rhyolite flows placed in a bounded half-graben (or graben).〔A. J. Reedman, B. E. Leveridge, R. B. Evans, ''The Arfon Group (Arvonian) of North Wales.'', 1984, ''Proceedings of the Geologists Association'', 95, 313-321〕 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「Arfon Group」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.