| Shell Rock Formation | |
|---|---|
| Stratigraphic range: Devonian | |
| Type | Formation |
| Sub-units | Mason City Member |
| Location | |
| Region | Iowa |
| Country | United States |
The Shell Rock Formation is a geologic formation in Iowa. It preserves fossils dating back to the Devonian period.
 | This article about a specific stratigraphic formation in Iowa is a stub. You can help Wikipedia by expanding it. |
 | This article related to the Devonian period is a stub. You can help Wikipedia by expanding it. |
