Powell Formation
The Powell Formation or Powell Dolomite is a geologic formation in northern Arkansas, southeast Missouri and Virginia. It contains gastropod, cephalopod, and trilobite fossils dating back to the Ordovician Period.
| Powell Formation | |
|---|---|
| Stratigraphic range: Ordovician | |
| Type | Formation |
| Underlies | Everton Formation |
| Overlies | Cotter Formation |
| Lithology | |
| Primary | Dolomite |
| Other | Shale, sandstone, chert |
| Location | |
| Region | Arkansas, Missouri and Virginia |
| Country | United States |
| Type section | |
| Named for | Powell railroad station (now abandoned), Marion County, Arkansas |
| Named by | Edward Oscar Ulrich |
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