This article needs additional citations for verification .(October 2017)  | 
| Dillsboro Formation | |
|---|---|
| Stratigraphic range: Ordovician | |
| Type | Formation | 
| Unit of | Maquoketa Group | 
| Underlies | Fort Atkinson Limestone and Whitewater Formation | 
| Overlies | Kope Formation | 
| Location | |
| Region | Indiana, Ohio | 
| Country | United States | 
The Dillsboro Formation is a geologic formation in Ohio. It preserves fossils dating back to the Ordovician period.