| Ashizawa Formation | |
|---|---|
| Stratigraphic range: | |
| Type | Geological formation |
| Unit of | Futaba Group |
| Sub-units | Asamigawa Member, Obisagawa Member |
| Underlies | Kasamatsu Formation |
| Overlies | Early Cretaceous Granite, Permian shale and sandstone |
| Location | |
| Region | northern Honshu |
| Country |  Japan |
The Ashizawa Formation is a Coniacian 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]
Palaeofauna
- Dinosauria indet.
- Squalus sp.
- Theria indet.
- Theropoda indet. ("Futabasaurus") - "tibia"[3]
See also
Footnotes
- ↑ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
- ↑ 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.
- ↑ Lambert, David; the Diagram Group (1990). The Dinosaur Data Book. New York: Avon Books. pp. 63–66, 250. ISBN 978-0-380-75896-8.
References
- Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.
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