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.
See also
List of fossiliferous stratigraphic units in Indiana List of fossiliferous stratigraphic units in Kentucky List of fossiliferous stratigraphic units in Ohio
References
Generalized Stratigraphic Chart for Ohio