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).

Futaba Group
Stratigraphic range: Coniacian–Santonian
TypeGeological group
Sub-unitsAshizawa Formation, Kasamatsu Formation, Tamayama Formation
UnderliesUnconformity with Paleogene Shiramizu Group
OverliesEarly Cretaceous Granite, Permian shale and sandstone
ThicknessOver 300 metres
Lithology
PrimarySandstone, siltstone, conglomerate
Location
Regionnorthern Honshu
CountryJapan

See also

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Footnotes

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  1. ^ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
  2. ^ 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

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