| Osgood Formation | |
| Type: | Formation |
| Age: | Sheinwoodian[1] |
| Period: | Sheinwoodian |
| Country: | United States |
| Underlies: | Laurel Limestone |
| Overlies: | Brassfield Formation and Dayton Formation |
| Extent: | Indiana, Kentucky, Mississippi, and Ohio |
The Osgood Formation, also known as the Osgood Shale is a geologic formation in Indiana, Kentucky, and Ohio. It preserves fossils dating back to the Silurian period.