Decorah Shale
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The Decorah Shale is a fossiliferous shale that makes up the lowermost formation in the Galena Group. The Decorah lies above the Platteville Limestone and below the Cummingsville Formation in the sedi
Decorah Shale exposed in Decorah, Iowa. The Decorah is gray; above it is the brown Cummingsville Formation.
Decorah, Iowa
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Decorah is the largest city in and the county seat of Winneshiek County, Iowa, United States. The population was 7,587 at the time of the 2020 census. Decorah is the home of Luther College, a private
2009 0528 Decorah downtown
2009 0528 Decorah Vesterheimmuseum
Dunnings spring Decorah Iowa
Luther College