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Bacton Group : ウィキペディア英語版 | Bacton Group
The Bacton Group is a Triassic lithostratigraphic group (a sequence of rock strata) beneath the southern part of the North Sea. The name is derived from Bacton on the Norfolk coast.These strata which are up to 600m thick are the offshore equivalent of the Roxby Formation and Sherwood Sandstone Group which occur in northeast England. The Group comprises a lower Bunter Shale Formation of red and brown to grey mudstones and an upper Bunter Sandstone Formation of dolomitic sandstones with mudstone interlayers.〔http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=BACT (BGS on-line lexicon of rock units)〕 ==References==
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