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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 Killas ： ウィキペディア英語版 Killas Killas is a Cornish mining term for metamorphic rock strata of sedimentary origin which were altered by heat from the intruded granites in the English counties of Devon and Cornwall. The term is used in both counties. ==Origin== The deposition of the killas strata occurred during the Devonian and Carboniferous geological periods. The sediments are not evenly spread over the county, with the Carboniferous beds only found in the far north of Cornwall. The depositional environments of the killas were very varied, as is revealed by the fossil content and the sedimentary sequences. The fossils indicate changes from anaerobic, deep ocean-basin environments to shallow sea environments. The deformed brachiopod fossil ''Cyrtospirifer verneuili'', known to quarrymen as the Delabole Butterfly, was found in the upper Devonian beds of North Cornwall.〔 Shortly after the deposition of the sediments, the Variscan orogeny caused the intrusion of the Cornubian batholith and the subsequent contact metamorphism created the metamorphic rocks seen today. This also put intense pressure on the sediments causing them to be folded and faulted. This is most apparent in the cliffs at Millook Haven on the north Cornwall coast, where the cliffs display an impressive series of angular recumbent folds. 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「Killas」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.