Mattoon Formation
| Mattoon Formation | |
|---|---|
| Stratigraphic range: Pennsylvanian | |
| Type | Formation |
| Unit of | McLeansboro Group |
| Overlies | Bond Formation |
| Location | |
| Region | Illinois and Indiana |
| Country | United States |
The Mattoon Formation is a geologic formation in Illinois. It preserves fossils dating back to the Carboniferous period.