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Gray Sandstone Group : ウィキペディア英語版 | Gray Sandstone Group
The Gray Sandstone Group is a late Silurian lithostratigraphic group (a sequence of rock strata) in west Wales. The strata are exposed in the coast around the Milford Haven area; outcrops occur either side of Marloes Bay. Besides quartzitic sandstones and mudstones, sandy rottenstones are found at outcrop. Fossils within the rottenstone beds include brachiopods and corals.〔Howells, M.F. 2007 ''British Regional Geology: Wales'' (Keyworth, Nottingham. British Geological Survey) pp86, 89-90〕 The rocks of this group have also previously been known as the Gray Sandstone Series.〔http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=GSA (BGS on-line lexicon of rock units)〕 ==References==
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