Akaiwa Formation

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Akaiwa Formation
Stratigraphic range: Hauterivian-Barremian
~132–125 Ma
TypeGeological formation
Unit ofTetori Group
UnderliesKitadani Formation
OverliesKuwajima Formation
Lithology
PrimarySandstone, conglomerate
Location
Coordinates36°12′N 136°42′E / 36.2°N 136.7°E / 36.2; 136.7Coordinates: 36°12′N 136°42′E / 36.2°N 136.7°E / 36.2; 136.7
Approximate paleocoordinates46°06′N 138°18′E / 46.1°N 138.3°E / 46.1; 138.3
RegionHonshu
Country Japan
Akaiwa Formation is located in Japan
Akaiwa Formation
Akaiwa Formation (Japan)

The Akaiwa Formation (Japanese: 赤岩層, romanizedAkaiwa-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 [3]

Fossil content[]

The following fossils have been reported from the formation:[1]

Reptiles
Ichnofossils

See also[]

References[]

  1. ^ Jump up to: a b Akaiwa Formation in the Paleobiology Database
  2. ^ Weishampel et al., 2004, pp.517-607
  3. ^ Jump up to: a b Hirayama et al., 2013
  4. ^ Matsukawa & Obata, 1994
  5. ^ Matsumoto et al., 2014
  6. ^ 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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