Okurodani Formation
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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]
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 |
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
References
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