| Bond Formation | |
|---|---|
| Stratigraphic range: Pennsylvanian | |
 Erisocrinus fossil from the Bond Formation | |
| Type | Formation |
| Unit of | McLeansboro Group |
| Sub-units | Lasalle Limestone Member |
| Underlies | Mattoon Formation |
| Overlies | Patoka Formation |
| Location | |
| Region | Illinois, Kentucky and Indiana |
| Country | United States |
The Bond Formation is a geologic formation in Illinois, Kentucky and Indiana. It preserves fossils dating back to the Carboniferous period.
