Ashizawa Formation

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Ashizawa Formation
Stratigraphic range: Coniacian
TypeGeological formation
Regionnorthern Honshu
Country Japan

The Ashizawa Formation is a Mesozoic geologic formation in northeastern Honshu, Japan. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.[1] A jawbone belonging to a therian mammal has also been discovered from this unit.[2]

See also[edit]


  1. ^ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
  2. ^ Kusuhashi, N., Suzuki, T., Terui, K., Sato, A., and Amiot, R. (2016) A Late Cretaceous mammalian dentary from the Ashizawa Formation (Futaba Group), Fukushima, northeastern Japan. Island Arc, 25: 403–409. doi: 10.1111/iar.12133.


  • Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.