Tamayama Formation

Tamayama Formation
Stratigraphic range: Coniacian–Santonian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Unit of	Futaba Group
Sub-units	Kohisagawa Member, Irimaza Member
Underlies	Unconformity with the Eocene Iwaki Formation
Overlies	Kasamatsu Formation
Thickness	~ 150 metres
Lithology
Primary	Sandstone
Other	Siltstone
Location
Region	northern 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

Paleofauna

• Futabasaurus suzukii
• Cretalamna appendiculata ^[3]
• Inoceramus
  • Inoceramus amakusensis ^[4]
  • Inoceramus mihoensis ^[4]
• Apiotrigonia minor ^[3]
• Glycymeris? sp. ^[3]
• Archaeromma chisatoi ^[5]
• Titanosauriformes indet. ^[4]
• Neosuchia indet. ^[6]

Paleoflora

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

See also

• Earth sciences portal
• Paleontology portal
• Dinosaurs portal

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with few dinosaur genera

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.
3. 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. 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

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