- Source: Akaiwa Formation
The Akaiwa Formation (Japanese: 赤岩層, romanized: Akaiwa-sō) is an Early Cretaceous (Hauterivian-Barremian) geologic formation in central Honshu, Japan. Indeterminate ornithischian fossils are known from the formation. Fossil ornithopod tracks have been reported from the formation. As well as the turtle Kappachelys
Fossil content
The following fossils have been reported from the formation:
Osteichthyes indet. - 'fish scales'
Reptiles
Turtles
Kappachelys okurai
Crocodylomorpha indet. - isolated teeth of small crocodiles
?Euornithopoda indet.
Neochoristodera indet. - a nearly complete right premaxilla
Ornithopoda indet. - isolated teeth of small ornithopods
?Theropoda indet.
Ichnofossils
Ornithischia indet. - tracks
See also
List of dinosaur-bearing rock formations
List of stratigraphic units with indeterminate dinosaur fossils
List of stratigraphic units with ornithischian tracks
Ornithopod tracks
References
= Bibliography
=
Matsumoto, R.; Manabe, M.; Evans, S. E. (2014), "The first record of a long-snouted chrositodere (Reptilia, Diapsida) from the Early Cretaceous of Isihikawa Prefecture, Japan", Historical Biology, 27: 583–594, doi:10.1080/08912963.2014.898296
Hirayama, R.; Isaji, S.; Hibino, T. (2013), Kappachelys okurai gen. et sp. nov., a new stem soft-shelled turtle from the Early Cretaceous of Japan. In D. B. Brinkman, P. A. Holroyd, J. D. Gardner, Morphology and Evolution of Turtles, pp. 179–185
Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2, retrieved 2019-02-21
Azuma, Y.; Tomida, Y. (1995), Early Cretaceous dinosaur fauna of the Tetori Group in Japan. In A. Sun, Y. Wang (eds.), Sixth Symposium on Mesozoic Terrestrial Ecosystems and Biota, Short Papers, pp. 125–131
Matsukawa, M.; Obata, I. (1994), "Dinosaurs and sedimentary environments in the Japanese Cretaceous: a contribution to dinosaur facies in Asia based on molluscan palaeontology and stratigraphy", Cretaceous Research, 15 (1): 101–125, Bibcode:1994CrRes..15..101M, doi:10.1006/cres.1994.1005
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