Futaba Group
Geologic formation in Japan
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.[1] It consists of both fluvial and shallow marine sediments.[2] 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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