Cotter Formation
Geologic formation in the United States
From Wikipedia, the free encyclopedia
The Cotter Formation is a geologic formation in Arkansas,[2] Missouri,[3] Oklahoma[4] 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[1] |
