| Dewey Formation | |
|---|---|
| Stratigraphic range: Carboniferous | |
| Type | Formation |
| Lithology | |
| Primary | Limestone |
| Location | |
| Region | Iowa, Oklahoma |
| Country | United States |
| Type section | |
| Named for | Dewey, Washington County, Oklahoma |
| Named by | D. W. Ohern, 1910 [1] |
The Dewey Formation is a geologic formation in Iowa and Oklahoma. It preserves fossils dating back to the Carboniferous period.
The Iola Formation is a geologic formation in Illinois, Iowa, Kansas 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 Pella 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 Spillville Formation is a geologic formation in Iowa and southeastern Minnesota. 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 Stewartville Formation is a geologic formation in Iowa. It preserves fossils dating back to the Ordovician period.
The Cummingsville Formation is a geologic formation in Iowa and Minnesota. It preserves fossils dating back to the Ordovician period.
The Oologah Formation is a geologic formation in Oklahoma. It preserves fossils dating back to the Carboniferous period.
The Nellie Bly Formation is a geologic formation in Oklahoma. It preserves fossils dating back to the Carboniferous period.
The Cape Formation is a geologic formation in Oklahoma. It preserves fossils dating back to the Ordovician period.
The Oil Creek Formation is a geologic formation in Oklahoma. It preserves fossils dating back to the Ordovician period.
The Viola Formation is a geologic formation in Oklahoma. It preserves fossils dating back to the Ordovician period.
The Blaine Formation is a geologic formation in Oklahoma. It preserves fossils dating back to the Permian period.
The Dog Creek Formation is a geologic formation in Oklahoma. It preserves fossils dating back to the Permian period.
The Hennessey Formation is a geologic formation in Oklahoma. It preserves fossils dating back to the Permian period.
The Henryhouse Formation is a geologic formation in Oklahoma. It preserves fossils dating back to the Silurian period.
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