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.[2]

Galena Group
Stratigraphic range: Darriwilian-Sandbian
Unidentified Trochonema from the Galena Group
TypeGroup
Sub-unitsDecorah Shale, Dunleith Formation, Wise Lake Formation, Dubuque Formation[1]
UnderliesMaquoketa Group
OverliesPlatteville Limestone
Location
CountryUnited States
ExtentMinnesota, Wisconsin and Illinois

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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