| Futaba Group | |
|---|---|
| Stratigraphic range: Coniacian–Santonian PreꞒ Ꞓ O S D C P T J K Pg N | |
| Type | Geological group |
| Sub-units | Ashizawa Formation, Kasamatsu Formation, Tamayama Formation |
| Underlies | Unconformity with Paleogene Shiramizu Group |
| Overlies | Early Cretaceous Granite, Permian shale and sandstone |
| Thickness | Over 300 metres |
| Lithology | |
| Primary | Sandstone, siltstone, conglomerate |
| Location | |
| Region | northern Honshu |
| Country | Japan |
The Futaba Group is a Late Cretaceous geologic group in Japan. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus. It consists of both fluvial and shallow marine sediments. The plesiosaur Futabasaurus was found in this unit (specifically the Tamayama Formation).
See also
Footnotes
- Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
- Ando, Hisao; Seishi, Masao; Oshima, Mitsuharu; Matsumaru, Tetsuya (1995). "Fluvial-Shallow Marine Depositional Systems of the Futaba Group (Upper Cretaceous). Depositional facies and sequences". Journal of Geography (Chigaku Zasshi). 104 (2): 284–303. doi:10.5026/jgeography.104.284. ISSN 0022-135X.
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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