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Tamayama Formation

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Tamayama Formation
Stratigraphic range: Coniacian–Santonian
TypeGeological formation
Unit ofFutaba Group
Sub-unitsKohisagawa Member, Irimaza Member
UnderliesUnconformity with the Eocene Iwaki Formation
OverliesKasamatsu Formation
Thickness~ 150 metres
Lithology
PrimarySandstone
OtherSiltstone
Location
Regionnorthern Honshu
Country Japan

The Tamayama Formation is a Coniacian-Santonian geologic formation in Japan. Dinosaur remains not referrable to the genus level are among the fossils that have been recovered from the formation.[1] The lower and middle part of the formation consists of braided river sandstone, while the upper portion consists of upper shoreface to inner shelf sandstone.[2] Vertebrate taxa from the formation include Futabasaurus and Cretalamna, along with titanosauriform teeth and neosuchian remains. Seeds of the nymphaeales plant Symphaenale futabensis are also known from this formation.

Fossils

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Paleofauna

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Paleoflora

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  • Symphaenale futabensis[7]
  • Esgueiria sp.[8]
  • Hironoia sp.[9]

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.
  3. ^ a b c Shimada, K.; Tsuihiji, T.; Sato, T.; Hasegawa, Y. (2010). "A remarkable case of a shark-bitten elasmosaurid plesiosaur". Journal of Vertebrate Paleontology. 30 (2): 592–597. Bibcode:2010JVPal..30..592S. doi:10.1080/02724631003621920. S2CID 128760390.
  4. ^ a b c Saegusa, H.; Tomida, Y. (2011). "Titanosauriform teeth from the Cretaceous of Japan". Anais da Academia Brasileira de Ciências. 83 (1): 247–265. doi:10.1590/S0001-37652011000100014.
  5. ^ Aiba, H.; Inose, H. (2024). "A New False Fairy Wasp (Hymenoptera: Mymarommatoidea: Mymarommatidae) in Late Cretaceous Iwaki Amber from Futaba Group of Iwaki City, Fukushima Prefecture, Japan". Paleontological Research. 28 (3): 1–8. doi:10.2517/PR230020.
  6. ^ Yoshida, J.; Takahashi, T.; Nabana, S. (2023). "A crocodyliform osteoderm from the Tamayama Formation(Upper Cretaceous) of Fukushima, Japan". Bulletin of the Fukushima Museum. 37: 29–36.
  7. ^ Takahashi, Masamichi; Friis, Else Marie; Crane, Peter R. (March 2007). "Fossil Seeds of Nymphaeales from the Tamayama Formation (Futaba Group), Late Cretaceous (Early Santonian) of Northeastern Honshu, Japan". International Journal of Plant Sciences. 168 (3): 341–350. doi:10.1086/510414. ISSN 1058-5893.
  8. ^ Takahashi, M.; Crane, P.R.; Ando, H. (1999-06-30). "Esgueiria futabensis sp. nov., a new angiosperm flower from the Upper Cretaceous (lower Coniacian) of northeastern Honshu, Japan". Paleontological Research. 3 (2): 81–87.
  9. ^ Takahashi, M.; Crane, P.R.; Manchester, S.R. (2002). "Hironoia fusiformis gen. et sp. nov.; a cornalean fruit from the Kamikitaba locality (Upper Cretaceous, Lower Coniacian) in northeastern Japan". Journal of Plant Research. 115 (6): 463–473. Bibcode:2002JPlR..115..463T. doi:10.1007/s10265-002-0062-6. PMID 12579450.

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.