Earth:Akaiwa Formation
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Short description: Early Cretaceous geologic formation in Japan
| Akaiwa Formation Stratigraphic range: Hauterivian-Barremian ~132–125 Ma | |
|---|---|
| Type | Geological formation |
| Unit of | Tetori Group |
| Underlies | Kitadani Formation |
| Overlies | Kuwajima Formation |
| Lithology | |
| Primary | Sandstone, conglomerate |
| Location | |
| Coordinates | [ ⚑ ] : 36°12′N 136°42′E / 36.2°N 136.7°E |
| Paleocoordinates | [ ⚑ ] 46°06′N 138°18′E / 46.1°N 138.3°E |
| Region | Honshu |
| Country |  Japan |
  Akaiwa Formation (Japan) | |
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]
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
- List of dinosaur-bearing rock formations
- List of stratigraphic units with indeterminate dinosaur fossils
- List of stratigraphic units with ornithischian tracks
- Ornithopod tracks
- List of stratigraphic units with ornithischian tracks
References
- ↑ 1.0 1.1 Akaiwa Formation in the Paleobiology Database
- ↑ Weishampel et al., 2004, pp.517-607
- ↑ 3.0 3.1 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, Japan. Historical 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 stratigraphy. Cretaceous Research 15. 101–125.
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