| 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]
Vertebrate Paleobiota
Amphibians
| Amphibians reported from the Okurodani Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Anura | Indeterminate | KO2 | Discoglossid grade | |||
| Caudata | Indeterminate | KO2 | ||||
Squamates
| Squamates reported from the Okurodani Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Sakurasaurus[3] | S. shokawensis | KO2 | ||||
| ?Anguimorpha | Indeterminate | KO2 | ||||
| Scincomorpha | Indeterminate | KO2 | new taxon | |||
| Squamata | Indeterminate | KO2 | 2 distinct taxa | |||
Turtles
| Turtles reported from the Okurodani Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| cf. Sinemys | Indeterminate | KO2 | ||||
| Sinochelys | Indeterminate | KO2 | Sinochelyidae | |||
| Adocidae | Indeterminate | KO2 | ||||
| Trionychidae | Indeterminate | KO2 | ||||
Choristoderes
| Choristoderes reported from the Okurodani Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Monjurosuchus | Indeterminate | KO2 | "Association of right squamosal, jugal, quadratojugal, and quadrate" |
| ||
| Shokawa | S. ikoi | KO2 | Partial skeleton | |||
See also
Footnotes
- ↑ Amiot, Romain; Kusuhashi, Nao; Saegusa, Haruo; Shibata, Masateru; Ikegami, Naoki; Shimojima, Shizuo; Sonoda, Teppei; Fourel, François; Ikeda, Tadahiro; Lécuyer, Christophe; Philippe, Marc; Wang, Xu (2021-01-01). "Paleoclimate and ecology of Cretaceous continental ecosystems of Japan inferred from the stable oxygen and carbon isotope compositions of vertebrate bioapatite" (PDF). Journal of Asian Earth Sciences. 205: 104602. doi:10.1016/j.jseaes.2020.104602. ISSN 1367-9120.
- ↑ "KO2 locality, Shokawa Village, Kobudani Valley (Cretaceous to of Japan)". Paleobiology Database.
- ↑ Evans, Susan E.; Manabe, Makoto (January 1999). "Early Cretaceous Lizards from the Okurodani Formation of Japan". Geobios. 32 (6): 889–899. doi:10.1016/s0016-6995(99)80871-7. ISSN 0016-6995.
References
- Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.
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