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Drefach Group : ウィキペディア英語版 | Drefach Group
The Drefach Group is an Ordovician lithostratigraphic group (a sequence of rock strata) in west Wales. The name is derived from the village of Drefach near Meidrim (a.k.a. Mydrim) in Carmarthenshire. The Group comprises the Mydrim Shales Formation, the Mydrim Limestone Formation, the Hendre Shales Formation, Asaphus Ash Formation and at its base, the underlying Felin-wen Formation.〔http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=DRE (BGS on-line lexicon of rock units)〕 ==Outcrops== The rocks are intermittently exposed in a belt of country running east from Fishguard Bay via Crymych then south towards Meidrim thence east via the north of Carmarthen along the Vale of Towy to Llandeilo.〔British Geological Survey 1:50,000 scale geological map (England & Wales) sheets 210, 211, 212, 228, 229〕
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