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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 Milford Haven Group ： ウィキペディア英語版 Milford Haven Group The Milford Haven Group is a late Silurian to early Devonian lithostratigraphic group (a sequence of rock strata) in west Wales. The name is derived from the estuary and town of Milford Haven in south Pembrokeshire. The Group comprises calcareous marls with occasional sandstones along with conglomerates and breccias.〔British Geological Survey 1:50,000 scale geological map (England & Wales) sheet 228 ''Haverfordwest''〕〔http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=MIH (BGS on-line lexicon of rock units)〕 The Group unconformably overlies rocks of the Gray Sandstone Group and comprises two different successions either side of the east-west aligned Ritec Fault To the north are (in ascending order) the Red Cliff, Albion Sands/Lindsway Bay, Sandy Haven and Gelliswick Bay formations. To the south are the Freshwater East, Moor Cliffs and Freshwater West formations. The Chapel Point Calcretes Member is recognised at the top of the Moor Cliffs Formation whilst the succeeding Freshwater West Formation is divided into a lower Conigar Pit Sandstone Member and an upper Rat Island Mudstone Member. The earlier of these formations are assigned to the Pridoli series of the Silurian. The top of the Silurian section is (according to some schemes) marked by the Townsend Tuff Member, above which lies the Lochkovian age strata. The Gelliswick Bay and Freshwater West formations are assigned to the local Dittonian series and straddle the internationally recognised Lochkovian and Pragian series. This suite of rocks is in turn conformably overlain by rocks of the Cosheston Group.〔Howells, M.F. 2007 ''British Regional Geology: Wales'' (Keyworth, Nottingham, British Geological Survey) p101〕〔Barclay, W.J. et al. 2005 ''The Old Red Sandstone of Great Britain'', Geological Conservation Review series, no 31 JNCC Peterborough. p212〕 ==References== 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「Milford Haven 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.