Cotter Formation
The Cotter Formation is a geologic formation in Arkansas, Missouri, Oklahoma and in Virginia. It preserves fossils dating back to the Ordovician period.
| Cotter Formation | |
|---|---|
| Stratigraphic range: Ordovician | |
| Type | Formation |
| Underlies | Powell Formation |
| Overlies | Jefferson City Formation |
| Lithology | |
| Primary | Dolomite |
| Other | Chert, sandstone, shale |
| Location | |
| Region | Arkansas, Missouri, Oklahoma, Virginia |
| Country | United States |
| Type section | |
| Named for | Cotter, Baxter County, Arkansas |
| Named by | Edward Oscar Ulrich |
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