Galena Group

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Galena Group
Stratigraphic range: Darriwilian-Sandbian
Trochonema.jpg
Unidentified Trochonema from the Galena Group
Type Group
Sub-units Decorah Shale, Dunleith Formation, Wise Lake Formation, Dubuque Formation [1]
Underlies Maquoketa Group
Overlies Platteville Limestone
Location
Country United States
Extent Minnesota, Wisconsin and Illinois

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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