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Maquoketa Formation : ウィキペディア英語版 | Maquoketa Formation
The Maquoketa Formation is a geologic formation in Illinois,〔''A comparison of the Maquoketa formation and its fauna in Eastern Wisconsin, Iowa and Illinois (1915), Thesis (M.A.) The University of Illinois〕 Indiana.〔(Maquoketa Group, Indiana Geological Survey )〕 Iowa, Kansas,〔(Ordovician in Kansas )〕 Minnesota,〔(Maquoketa Formation in Minnesota )〕 Missouri,〔''The Stratigraphic Succession in Missouri,'' Missouri Geological Survey, Vol. XL 2nd series, 1961, pp 30-31〕 and Wisconsin.〔(USGS, ''Maquoketa Formation'' )〕 It preserves mollusk, coral, brachiopod and graptolite fossils〔 dating back to the Ordovician period. ==See also==
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