Akaiwa Formation
The Akaiwa Formation (Japanese: 赤岩層, romanized: Akaiwa-sō) is an Early Cretaceous (Hauterivian-Barremian) geologic formation in central Honshu, Japan.[1] Indeterminate ornithischian fossils are known from the formation. Fossil ornithopod tracks have been reported from the formation.[2] As well as the turtle Kappachelys[3]
| Akaiwa Formation | |
|---|---|
| Stratigraphic range: Hauterivian-Barremian ~ | |
| Type | Geological formation |
| Unit of | Tetori Group |
| Underlies | Kitadani Formation |
| Overlies | Kuwajima Formation |
| Lithology | |
| Primary | Sandstone, conglomerate |
| Location | |
| Coordinates | 36.2°N 136.7°E |
| Approximate paleocoordinates | 46.1°N 138.3°E |
| Region | Honshu |
| Country |  Japan |
  Akaiwa Formation (Japan) | |
Fossil content
The following fossils have been reported from the formation:[1]
- Osteichthyes indet. - 'fish scales'
- Reptiles
- Turtles
- Kappachelys okurai[3]
- Crocodylomorpha indet. - isolated teeth of small crocodiles[4]
- ?Euornithopoda indet.
- Neochoristodera indet. - a nearly complete right premaxilla[5]
- Ornithopoda indet. - isolated teeth of small ornithopods
- ?Theropoda indet.
- Ichnofossils
- Ornithischia indet. - tracks[6]
See also
References
- Akaiwa Formation in the Paleobiology Database
- Weishampel et al., 2004, pp.517-607
- Hirayama et al., 2013
- Matsukawa & Obata, 1994
- Matsumoto et al., 2014
- Azuma & Tomida, 1995
Bibliography
- Matsumoto, R.; M. Manabe, and S. E. Evans. 2014. The first record of a long-snouted chrositodere (Reptilia, Diapsida) from the Early Cretaceous of Isihikawa Prefecture, JapanHistorical Biology 27. 583–594.
- Hirayama, R.; S. Isaji, and T. Hibino. 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 (eds.), 179–185.Morphology and Evolution of Turtles.
- Weishampel, David B.; Peter Dodson, and Halszka Osmólska (eds.). 2004. The Dinosauria, 2nd edition, 1–880.Berkeley: University of California Press. Accessed 2019-02-21.. ISBN 0-520-24209-2
- Azuma, Y., and Y. Tomida. 1995. Early Cretaceous dinosaur fauna of the Tetori Group in Japan. In A. Sun, Y. Wang (eds.), 125–131.Sixth Symposium on Mesozoic Terrestrial Ecosystems and Biota, Short Papers.
- Matsukawa, M., and I. Obata. 1994. Dinosaurs and sedimentary environments in the Japanese Cretaceous: a contribution to dinosaur facies in Asia based on molluscan palaeontology and stratigraphyCretaceous Research 15. 101–125.
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