Okurodani Formation
| 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. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.[1] 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
- ^ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
- ^ "KO2 locality, Shokawa Village, Kobudani Valley (Cretaceous to of Japan)". Paleobiology Database.
{{cite web}}: CS1 maint: url-status (link) - ^ 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.