File:Decorah area geology.png
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Categories:
- Decorah, Iowa
- Geology of Iowa
- Winneshiek Shale
- Geological maps of Iowa
- Windrow Formation
- Cedar Valley Formation
- Wapsipinicon Formation
- LaPorte City Formation
- Waucoma Formation
- Maquoketa Group - maps
- Galena Group
- Dubuque Formation
- Wise Lake Formation
- Decorah Formation
- Platteville Group - maps
- Glenwood Formation
- St. Peter Sandstone - maps
- Prairie du Chien Group - maps
- Shakopee Formation - maps
- Oneota Formation
- Jordan Sandstone
- St. Lawrence Formation
- Lone Rock Formation
- Wonewoc Formation
- Eau Claire Formation
- Mount Simon Sandstone
- Geological cross sections of Iowa
- Maquoketa Group - stratigraphic columns
- Stratigraphic columns of Iowa
- Platteville Group - stratigraphic columns
- St. Peter Sandstone - stratigraphic columns
- Prairie du Chien Group - stratigraphic columns
- Bedrock geology of the United States
- Decorah Impact Crater