| Okurodani Formation | |
|---|---|
| Stratigraphic range: | |
| Type | Geological formation |
| Unit of | Tetori Group |
| Underlies | Amagodani Formation |
| Overlies | Otaniyama Formation |
| Lithology | |
| Primary | Mudstone, Siltstone, Sandstone |
| Other | Tuffite |
| Location | |
| Region | Gifu Prefecture |
| Country | Japan |
The Okurodani Formation is an Early Cretaceous geologic formation in central Honshu, Japan. Part of the Tetori Group, it primarily consists of freshwater continental sediments deposited in a floodplain environment, with occasional volcanic tuffite horizons. It has an uncertain age, probably dating between the Hauterivian and Aptian.[1] An indeterminate iguanodontian dinosaur tooth has been recovered from the formation. Many other fossil vertebrates are known from the KO2 locality[2]