Galena Group

Paleozoic Stratigraphy of the Upper Midwest, USA
Dates approximate
Maquoketa Group (446–440 Ma)
Galena Group (454–446 Ma)
  • Dubuque Formation (447–446 Ma)
  • Wise Lake Formation (449.4–447 Ma)
  • Decorah Shale (454–452 Ma)
Platteville Limestone (455–454 Ma)
Glenwood Shale (~455 Ma)
St. Peter Sandstone (~459–~455 Ma)
Knox Unconformity (~470-~459 Ma)
Knox Supergroup (~497-~470 Ma)
  • Everton Dolomite
  • Shakopee Dolomite
  • Oneota Dolomite
  • Jordan Sandstone
  • Potosi Dolomite
  • Potsdam Sandstone
    • Munising Formation
      • Davis Formation
        • Franconia Formation
        • Ironton Sandstone
        • Galesville Sandstone
      • Eau Claire Formation
    • Mount Simon Sandstone
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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.[2]

References

  1. ^ Raatz, William; Ludvigson, Greg (1996). "Depositional environments and sequence stratigraphy of Upper Ordovician epicontinental deep water deposits, eastern Iowa and southern Minnesota". Special Paper of the Geological Society of America. 306 – via ResearchGate.
  2. ^ 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.


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