Johns Valley Formation
The Johns Valley Formation is a geologic formation in Arkansas and Oklahoma. It preserves fossils dating back to the Carboniferous period.
| Johns Valley Formation | |
|---|---|
| Stratigraphic range: Carboniferous: Pennsylvanian | |
| Type | Formation |
| Underlies | Atoka Formation |
| Overlies | Jackfork Sandstone |
| Lithology | |
| Primary | Shale |
| Other | Sandstone |
| Location | |
| Region | Arkansas and Oklahoma |
| Country | United States |
| Type section | |
| Named for | Johns Valley, Pushmataha County, Oklahoma |
| Named by | Edward Oscar Ulrich, 1927 |
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