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Galena Group : ウィキペディア英語版 | Galena Group
The Galena Group or Galena Limestone refers to a sedimentary sequence of Ordovician limestone that was deposited atop the Decorah Shale. It is part of the Ordovician stratigraphy of the Upper Midwestern United States. It was deposited in a calm marine environment, and is fossiliferous.〔Mossler, J. and Benson, S., 1995, 1999, 2006, (Fossil Collecting in the Twin Cities Area ). Minnesota at a Glance: Minnesota Geological Survey: University of Minnesota.〕 ==References==
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