| Pentagon Formation | |
|---|---|
| Stratigraphic range: Cambrian | |
| Type | Formation |
| Location | |
| Region | Montana |
| Country | United States |
The Pentagon Formation is a geologic formation in Montana. It preserves fossils dating back to the Cambrian period.
 | This article about a specific stratigraphic formation in Montana is a stub. You can help Wikipedia by expanding it. |
 | This article related to the Cambrian period is a stub. You can help Wikipedia by expanding it. |
