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Penarth Group : ウィキペディア英語版
Penarth Group

The Penarth Group is a Rhaetian age (Triassic) lithostratigraphic group (a sequence of rock strata) which is widespread in Britain. It is named from the seaside town of Penarth near Cardiff in south Wales where strata of this age are exposed in coastal cliffs southwards to Lavernock Point. This sequence of rocks was previously known as the Rhaetic.〔
==Stratigraphy==
It includes the Lilstock Formation and the underlying Westbury Formation. The Langport and Cotham Members, grey limestones of marine origin with associated mudstones, are recognised within the Lilstock Formation, itself named from Lilstock in west Somerset.〔British Geological Survey 1:50,000 scale geological map sheet (England and Wales series) 326 ''Sidmouth''〕〔(The BGS Lexicon of Named Rock Units — Result Details: Penarth Group )〕 The Westbury Formation is named from Westbury-on-Severn in Gloucestershire.〔(The BGS Lexicon of Named Rock Units — Result Details: Westbury Formation )〕

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