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Gwna Group
The Gwna Group is a late Precambrian (Ediacaran) / Cambrian lithostratigraphic group (a sequence of rock strata) in northwest Wales. The name is derived from the Afon Gwna, a river near Bodorgan on Anglesey where the strata are exposed.〔http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=NGW (BGS on-line lexicon of rock units)〕 This rock sequence is also commonly referred to as the Gwna Mélange. ==Outcrops== These rocks are exposed across various parts of Anglesey and along the northern coast of Llŷn and at Bardsey Island〔British Geological Survey 1:50,000 scale geological map (England & Wales) sheet 133, 134 & Special sheet ''Anglesey''〕〔http://mapapps.bgs.ac.uk/geologyofbritain/home.html〕 The extensive coastal cliffs at each of these locations affords excellent exposure.
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「Gwna Group」の詳細全文を読む
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