| Hailey Shales Formation | |
|---|---|
| Stratigraphic range: Cretaceous | |
| Type | Formation |
| Location | |
| Region | Wyoming |
| Country | United States |
The Hailey Shales Formation is a geologic formation in Wyoming. It preserves fossils dating back to the Cretaceous period.Plesiopleurodon was found in this formation.
 | This article about a specific stratigraphic formation in Wyoming is a stub. You can help Wikipedia by expanding it. |
 | This article related to the Cretaceous period is a stub. You can help Wikipedia by expanding it. |
