| Bond Formation | |
| Type: | Formation |
| Age: | Pennsylvanian |
| Period: | Pennsylvanian |
| Region: | Illinois, Kentucky and Indiana |
| Country: | United States |
| Unitof: | McLeansboro Group |
| Subunits: | Lasalle Limestone Member |
| Underlies: | Mattoon Formation |
| Overlies: | Patoka Formation |
The Bond Formation is a geologic formation in Illinois, Kentucky and Indiana. It preserves fossils dating back to the Carboniferous period.