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. An indeterminate iguanodontian dinosaur tooth has been recovered from the formation. Many other fossil vertebrates are known from the KO2 locality
Fossil records
Molluscs Molluscs reported from the Okurodani FormationGenusSpeciesLocationStratigraphic positionMaterialNotesImagesMargaritifera M. ogamigoensisNagdongiaN. soni?Batissa?B. antiquaNippononaiaN. tetoriensisMyreneM. tetoriensisTetoriaT. yokoyamaiSphaeriumS. coreanicumViviparusV. ongoensis
Amphibians Amphibians reported from the Okurodani FormationGenusSpeciesLocationStratigraphic positionMaterialNotesImagesAnuraIndeterminateKO2Discoglossid gradeCaudata IndeterminateKO2
Squamates Squamates reported from the Okurodani FormationGenusSpeciesLocationStratigraphic positionMaterialNotesImagesSakurasaurusS. shokawensis KO2?Anguimorpha IndeterminateKO2Scincomorpha IndeterminateKO2new taxonSquamata IndeterminateKO22 distinct taxa
Turtles Turtles reported from the Okurodani FormationGenusSpeciesLocationStratigraphic positionMaterialNotesImagescf. Sinemys IndeterminateKO2SinochelysIndeterminateKO2SinochelyidaeAdocidae IndeterminateKO2Trionychidae IndeterminateKO2
Choristoderes Choristoderes reported from the Okurodani FormationGenusSpeciesLocationStratigraphic positionMaterialNotesImagesMonjurosuchusIndeterminateKO2"Association of right squamosal, jugal, quadratojugal, and quadrate"ShokawaS. ikoiKO2Partial skeleton
See also
List of dinosaur-bearing rock formations List of stratigraphic units with indeterminate dinosaur fossils
Footnotes
References Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. .