Kuwajima Formation
The Kuwajima Formation is an Early Cretaceous geologic formation in Japan. Its precise age is uncertain due to a lack of identifying fossils, and it was previously considered likely Valanginian to Hauterivian in age. However, it is now considered to probably be Barremian in age. Dinosaurs and other vertebrates has been recovered from the Kaseki-kabe "Fossil-bluff" locality in the uppermost part of the formation.
| Kuwajima Formation | |
|---|---|
| Stratigraphic range: | |
| Unit of | Tetori Group |
| Sub-units | Lower Member, Upper Member |
| Underlies | Akaiwa Formation |
| Overlies | Gomijima Formation |
| Lithology | |
| Primary | Sandstone, Mudstone |
| Location | |
| Country | Japan |
The multituberculate mammals Hakusanobaatar matsuoi and Tedoribaatar reini are known from the Kuwajima Formation. A member of Tritylodontidae, Montirictus kuwajimaensis, has also been recovered from the unit.
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