Futaba Group

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Futaba Group
Stratigraphic range: Coniacian–Santonian
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
ThicknessOver 300 metres
Lithology
Primary Sandstone, siltstone, conglomerate
Location
Regionnorthern Honshu
CountryJapan

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).

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Footnotes

  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.

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