Earth:Okurodani Formation
From HandWiki
Okurodani Formation Stratigraphic range: Hauterivian–Aptian | |
---|---|
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
- List of dinosaur-bearing rock formations
- List of stratigraphic units with indeterminate dinosaur fossils
Footnotes
- ↑ Amiot, Romain; Kusuhashi, Nao; Saegusa, Haruo; Shibata, Masateru; Ikegami, Naoki; Shimojima, Shizuo; Sonoda, Teppei; Fourel, François et al. (2021-01-01). "Paleoclimate and ecology of Cretaceous continental ecosystems of Japan inferred from the stable oxygen and carbon isotope compositions of vertebrate bioapatite" (in en). Journal of Asian Earth Sciences 205: 104602. doi:10.1016/j.jseaes.2020.104602. ISSN 1367-9120. https://hal.archives-ouvertes.fr/hal-03000561/file/Ms%20Amiot%20et%20al%203rd%20revised.pdf.
- ↑ "KO2 locality, Shokawa Village, Kobudani Valley (Cretaceous to of Japan)". https://paleobiodb.org/classic/basicCollectionSearch?collection_no=50310.
- ↑ 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.
Original source: https://en.wikipedia.org/wiki/Okurodani Formation.
Read more |