| Cummingsville Formation | |
|---|---|
| Stratigraphic range: Ordovician | |
 Cummingsville Formation in Decorah, Iowa. The Cummingsville is the brown upper unit; the Decorah Shale is below. | |
| Type | Formation |
| Overlies | Decorah Shale |
| Location | |
| Country | United States |
| Extent | Iowa and Minnesota |
The Cummingsville Formation is a geologic formation in Iowa and Minnesota. It preserves fossils dating back to the Ordovician period.
The Warsaw Formation is a geologic formation in Illinois, Iowa and Missouri. It preserves fossils dating back to the Mississippian subperiod.
The Chapin Formation is a geologic formation in Iowa. It preserves fossils dating back to the Carboniferous period.
The Dewey Formation is a geologic formation in Iowa and Oklahoma. It preserves fossils dating back to the Carboniferous period.
The Hampton Formation is a geologic formation in Iowa. It preserves fossils dating back to the Carboniferous period.
The Maynes Creek Formation is a geologic formation in Iowa. It preserves fossils dating back to the Carboniferous period.
The Labette Formation is a geologic formation in Iowa, United States. It preserves fossils dating back to the Carboniferous period.
The Pella Formation is a geologic formation in Iowa. It preserves fossils dating back to the Carboniferous period.
The Kanwaka Formation is a geologic formation in Iowa. It preserves fossils dating back to the Carboniferous period.
The St. Louis Formation is a geologic formation in Iowa. It preserves fossils dating back to the Carboniferous period.
The Coralville Formation is a geologic formation in Iowa. It preserves fossils dating back to the Devonian period.
The Lithograph City Formation is a geologic formation in Iowa, part of the Cedar Valley Group. It preserves fossils dating back to the Devonian period. The formation is composed of dolomite and limestone, with many fossils and vugs in the lower part, while the upper part contains few fossils.
The Lime Creek Formation is a geologic formation in Iowa. It preserves fossils dating back to the Devonian period.
The Spillville Formation is a geologic formation in Iowa. It preserves fossils dating back to the Devonian period.
The Cedar Valley Formation is a geologic formation in Iowa. It preserves fossils dating back to the Devonian period. No type locality has ever been designated for this formation, but it is best known for limestone and dolomite exposures in and around Johnson County, Iowa. The formation is exposed in numerous road cuts, quarries and valley walls over much of north-east and north-central Iowa.
The Sheffield Formation is a geologic formation in Iowa. It preserves fossils dating back to the Devonian period.
The Wapsipinicon Formation is a geologic formation in Iowa. It preserves fossils dating back to the Devonian period.
The Stewartville Formation is a geologic formation in Iowa. It preserves fossils dating back to the Ordovician period.
The Blanding Formation is a geologic formation in Iowa. It preserves fossils dating back to the Silurian period.
The LaPorte City Formation is a geologic formation in Iowa. It preserves fossils dating back to the Silurian period.
The Racine Formation is a geologic formation in Iowa. It preserves fossils dating back to the Silurian period.
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