| Arnheim Formation | |
|---|---|
| Stratigraphic range: Katian[1] | |
_(Arnheim_Formation,_Upper_Ordovician;_Roaring_Run,_Warren_County,_Ohio,_USA)_1_(43669198710).jpg) Fossil brachiopod from the Arnheim Formation in Ohio | |
| Type | Formation |
| Underlies | Waynesville Formation |
| Overlies | Grant Lake Formation |
| Lithology | |
| Primary | limestone |
| Other | shale |
| Location | |
| Region |  Ohio |
| Country |  United States |
The Arnheim Formation is a geologic formation in Ohio. It preserves fossils dating back to the Ordovician period.
- ^ Schramm, Thomas J. (2011). Sequence Stratigraphy of the Late Ordovician (Katian), Maysvillian Stage of the Cincinnati Arch, Indiana, Kentucky, and Ohio, U.S.A (MS thesis). University of Cincinnati.