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
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| Genus
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Species
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Location
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Stratigraphic position
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Material
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Notes
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Images
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| Anura
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Indeterminate
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KO2
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|
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Discoglossid grade
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| Caudata
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Indeterminate
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KO2
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|
|
|
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Squamates
| Squamates reported from the Okurodani Formation
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| Genus
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Species
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Location
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Stratigraphic position
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Material
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Notes
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Images
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| Sakurasaurus[3]
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S. shokawensis
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KO2
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|
|
|
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| ?Anguimorpha
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Indeterminate
|
KO2
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|
|
|
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| Scincomorpha
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Indeterminate
|
KO2
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|
|
new taxon
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|
| Squamata
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Indeterminate
|
KO2
|
|
|
2 distinct taxa
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|
Turtles
| Turtles reported from the Okurodani Formation
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| Genus
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Species
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Location
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Stratigraphic position
|
Material
|
Notes
|
Images
|
| cf. Sinemys
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Indeterminate
|
KO2
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|
|
|
|
| Sinochelys
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Indeterminate
|
KO2
|
|
|
Sinochelyidae
|
|
| Adocidae
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Indeterminate
|
KO2
|
|
|
|
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| Trionychidae
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Indeterminate
|
KO2
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|
|
|
|
Choristoderes
| Choristoderes reported from the Okurodani Formation
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| Genus
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Species
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Location
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Stratigraphic position
|
Material
|
Notes
|
Images
|
| Monjurosuchus
|
Indeterminate
|
KO2
|
|
"Association of right squamosal, jugal, quadratojugal, and quadrate"
|
|
|
| Shokawa
|
S. ikoi
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KO2
|
|
Partial skeleton
|
|
See also
- ^ 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. Bibcode:2021JAESc.20504602A. 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. Bibcode:1999Geobi..32..889E. 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.