Galena Group

{{Short description|Sedimentary sequence of Ordovician limestone}}

{{Infobox rockunit

| name = Galena Group

| image = Trochonema.jpg

| caption = Unidentified Trochonema from the Galena Group

| type = Group

| age = Darriwilian-Sandbian

| period = Ordovician

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| country = United States

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| subunits = Decorah Shale, Dunleith Formation, Wise Lake Formation, Dubuque Formation{{Cite journal|last=Raatz|first=William|last2=Ludvigson|first2=Greg|date=1996|title=Depositional environments and sequence stratigraphy of Upper Ordovician epicontinental deep water deposits, eastern Iowa and southern Minnesota|url=https://www.researchgate.net/publication/265561720_Depositional_environments_and_sequence_stratigraphy_of_Upper_Ordovician_epicontinental_deep_water_deposits_eastern_Iowa_and_southern_Minnesota|journal=Special Paper of the Geological Society of America|volume=306|via=ResearchGate}}

| underlies = Maquoketa Group

| overlies = Platteville Limestone

| thickness =

| extent = Minnesota, Wisconsin and Illinois

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}}{{Paleozoic Stratigraphy of the Upper Midwest}}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, [https://web.archive.org/web/20170712030525/ftp://mgssun6.mngs.umn.edu/pub2/mnglance/.%2FMn_Fossils.pdf Fossil Collecting in the Twin Cities Area]. Minnesota at a Glance: Minnesota Geological Survey: University of Minnesota.