| Wabash Formation | |
|---|---|
| Stratigraphic range: Silurian | |
| Type | Formation |
| Underlies | Backbone Limestone, Detroit River Formation, and Grassy Knob Chert |
| Overlies | Louisville Limestone and Pleasant Mills Formation |
| Location | |
| Region | Indiana |
| Country | United States |
The Wabash Formation is a geologic formation in Indiana. It preserves fossils dating back to the Silurian period.