Kuwajima Formation

The Kuwajima Formation is an Early Cretaceous geologic formation in Japan. Its precise age is uncertain due to a lack of identifying fossils, and it was previously considered likely Valanginian to Hauterivian in age.[1] However, it is now considered to probably be Barremian in age.[2] Dinosaurs and other vertebrates has been recovered from the Kaseki-kabe "Fossil-bluff" locality in the uppermost part of the formation.[3]

Kuwajima Formation
Stratigraphic range: Barremian
↓
Unit ofTetori Group
Sub-unitsLower Member, Upper Member
UnderliesAkaiwa Formation
OverliesGomijima Formation
Lithology
PrimarySandstone, Mudstone
Location
Country Japan

The multituberculate mammals Hakusanobaatar matsuoi and Tedoribaatar reini are known from the Kuwajima Formation.[4] A member of Tritylodontidae, Montirictus kuwajimaensis, has also been recovered from the unit.[5]

Vertebrate Paleobiota

Amphibians
Amphibians reported from the Kuwajima Formation
Genus Species Location Stratigraphic position Material Notes Images
Shirerpeton[6] S. isajii Kaseki-kabe Facies III Partial disarticulated skull Albanerpetontid
Anura Indeterminate

Choristoderes
Choristoderes reported from the Kuwajima Formation
Genus Species Location Stratigraphic position Material Notes Images
Monjurosuchus Indeterminate Kaseki-kabe Facies III
Monjurosuchus
Choristodera Indeterminate Kaseki-kabe Facies III

Squamates
Squamates reported from the Kuwajima Formation
Genus Species Location Stratigraphic position Material Notes Images
Asagaolacerta A. tricuspidens Kaseki-kabe Facies III "An association of skull, jaws and postcranial bones of a small lizard with facetted tricuspid teeth, possibly a right maxilla"
Kaganaias
Hakuseps H. imberis Kaseki-kabe Facies III An almost complete left dentary
Kaganaias K. hakusanensis Kaseki-kabe Facies III "Part and counterpart of articulated partial skeleton comprising parts of the dors. vert. series and parts of the tail, pelvis, and hind limbs"
Kuroyuriella K. mikikoi Kaseki-kabe Facies III "A disarticulated skull on four originally conjoined blocks, an association on two small blocks"
Kuwajimalla[7] K. kagaensis Kaseki-kabe Facies III
Sakurasaurus Indeterminate Kaseki-kabe Facies III "Small block with disarticulated association of skull bones, vertebrae, ribs, pelvis and hindlimb bones"
Paramacellodidae Indeterminate Kaseki-kabe Facies III
Squamata Indeterminate Kaseki-kabe Facies III Five distinct taxa

Dinosaurs
Dinosaurs reported from the Kuwajima Formation
Genus Species Location Stratigraphic position Material Notes Images
Albalophosaurus[3] A. yamaguchiorum Kaseki-kabe Facies III Partial skull and lower jaws
Dromaeosauridae Indeterminate Kaseki-kabe Facies III
Enantiornithes Indeterminate Kaseki-kabe Facies III
Ornithischia[8] Indeterminate Right dentary, left maxilla, isolated teeth Distinct from Albalophosaurus
Sauropoda Indeterminate Kaseki-kabe Facies III
Styracosterna[8] Indeterminate Maxillary and dental teeth

Mammaliamorphs
Mammaliamorphs reported from the Kuwajima Formation
Genus Species Location Stratigraphic position Material Notes Images
Hakusanobaatar[4] H. matsuoi Kaseki-kabe Facies III Dentary fragments and teeth Eobaatarid
Hakusanodon[9] H. archaeus Kaseki-kabe Facies III
Montirictus[5] M. kuwajimaensis Kaseki-kabe Facies III Tritylodontid
Tedoribaatar[4] T. reini Kaseki-kabe Facies III "Fragment of right lower jaw with p4" Eobaatarid
Multituberculata Indeterminate Kaseki-kabe Facies III

Invertebrate Paleobiota
Invertebrates reported from the Kuwajima Formation
Genus Species Location Stratigraphic position Material Notes Images
Nipponoridium B. matsuoi Kaseki-Kabe Mimarachnid hemipteran
Nipponohagla N. kaga Prophalangopsid
Kagapsychops K. araneus Psychopsid

See also
  • List of dinosaur-bearing rock formations

References
  1. Fujita, M. (2003). "Geological age and correlation of the vertebrate-bearing horizons in the Tetori Group". Memoir of the Fukui Prefectural Dinosaur Museum. 2: 3–14.
  2. "Paleoclimate and ecology of Cretaceous continental ecosystems of Japan inferred from the stable oxygen and carbon isotope compositions of vertebrate bioapatite". Journal of Asian Earth Sciences. 205: 104602. 2021-01-01. doi:10.1016/j.jseaes.2020.104602. ISSN 1367-9120.
  3. Ohashi, T.; Barrett, P. M. (2009). "A new ornithischian dinosaur from the Lower Cretaceous Kuwajima Formation of Japan". Journal of Vertebrate Paleontology. 29 (3): 748–757. doi:10.1671/039.029.0306.
  4. Kusuhashi, Nao (September 2008). "Early Cretaceous Multituberculate Mammals from the Kuwajima Formation (Tetori Group), Central Japan". Acta Palaeontologica Polonica. 53 (3): 379–390. doi:10.4202/app.2008.0302. ISSN 0567-7920.
  5. Hiroshige Matsuoka, Nao Kusuhashi and Ian J. Corfe (2016). "A new Early Cretaceous tritylodontid (Synapsida, Cynodontia, Mammaliamorpha) from the Kuwajima Formation (Tetori Group) of central Japan". Journal of Vertebrate Paleontology. Online edition:
  6. Matsumoto, Ryoko; Evans, Susan E. (2018-01-03). "The first record of albanerpetontid amphibians (Amphibia: Albanerpetontidae) from East Asia". PLOS ONE. 13 (1): e0189767. doi:10.1371/journal.pone.0189767. ISSN 1932-6203. PMC 5752013. PMID 29298317.
  7. Evans, Susan E.; Manabe, Makoto (March 2008). "An early herbivorous lizard from the Lower Cretaceous of Japan". Palaeontology. 51 (2): 487–498. doi:10.1111/j.1475-4983.2008.00759.x. ISSN 0031-0239.
  8. Barrett, Paul M.; Ohashi, Tomoyuki (October 2015). "Ornithischian dinosaur material from the Kuwajima Formation (Tetori Group: Lower Cretaceous) of Ishikawa Prefecture, Japan". Historical Biology. 28 (1–2): 280–288. doi:10.1080/08912963.2015.1032273. ISSN 0891-2963.
  9. Rougier, Guillermo W.; Isaji, Shinji; Manabe, Makoto (2007). "AN EARLY CRETACEOUS MAMMAL FROM THE KUWAJIMA FORMATION (TETORI GROUP), JAPAN, AND A REASSESSMENT OF TRICONODONT PHYLOGENY". Annals of Carnegie Museum. 76 (2): 73. doi:10.2992/0097-4463(2007)76[73:aecmft]2.0.co;2. ISSN 0097-4463.

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