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