Futaba Group

Futaba Group
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
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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).

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.

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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