The Sebayashi Formation is a

Barremian The Barremian is an age in the geologic timescale (or a chronostratigraphic stage) between 129.4 ± 1.5 Ma (million years ago) and 121.4 ± 1.0 Ma). It is a subdivision of the Early Cretaceous Epoch (or Lower Cretaceous Series). It is preceded ...

Albian The Albian is both an age of the geologic timescale and a stage in the stratigraphic column. It is the youngest or uppermost subdivision of the Early/Lower Cretaceous Epoch/Series. Its approximate time range is 113.0 ± 1.0 Ma to 100.5 ± 0.9 M ...

geologic

formation Formation may refer to: Linguistics * Back-formation, the process of creating a new lexeme by removing or affixes * Word formation, the creation of a new word by adding affixes Mathematics and science * Cave formation or speleothem, a secondar ...

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

.Sebayashi Formation
at

Fossilworks Fossilworks is a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals ...

.org

Dinosaur Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the evolution of dinosaurs is t ...

remains are among the fossils that have been recovered from the formation, although only two species, ''

Fukuivenator ''Fukuivenator'' ("hunter of Fukui Prefecture") is an extinct genus of therizinosaurian theropod dinosaur from the Early Cretaceous of Japan. Discovery and naming The type species ''Fukuivenator paradoxus'' was in 2016 named and described by ...

'' and ''

Siamosaurus ''Siamosaurus'' (meaning "Siam reptile") is a genus of spinosaurid dinosaur that lived in what is now known as China and Thailand during the Early Cretaceous period (Barremian to Aptian) and is the first reported spinosaurid from Asia. It is ...

'', have been referred to a specific

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

.Weishampel et al., 2004, pp.517-607

Paleofauna

Bivalvia Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of w ...

indet. * Dinosauria indet. - "Footprints" *

Ornithopoda Ornithopoda () is a clade of ornithischian dinosaurs, called ornithopods (), that started out as small, bipedal running grazers and grew in size and numbers until they became one of the most successful groups of herbivores in the Cretaceous world ...

indet. - "Footprints" * ''

''? - "Tooth (GMNH-PV-999)"Hasegawa et al., 2003 *

Spinosauridae The Spinosauridae (or spinosaurids) are a clade or family of tetanuran theropod dinosaurs comprising ten to seventeen known genera. They came into prominence during the Cretaceous period. Spinosaurid fossils have been recovered worldwide, includin ...

indet. "Tooth (KDC-PV-0003)" * aff. ''

Fukuiraptor kitadaniensis ''Fukuiraptor'' ("thief of Fukui") was a medium-sized megaraptoran theropod dinosaur of the Early Cretaceous epoch (either Barremian or Aptian) that lived in what is now Japan. ''Fukuiraptor'' is known from the Kitadani Formation and possibly ...

'' - "Tooth" *

Theropoda Theropoda (; ), whose members are known as theropods, is a dinosaur clade that is characterized by hollow bones and three toes and claws on each limb. Theropods are generally classed as a group of saurischian dinosaurs. They were ancestrally ca ...

indet. - "Footprints"

References

Bibliography

* * {{cite LSA , last=Hasegawa , first=Y , last2= Buffetaut , first2=Éric , last3=Manabe , first3=M. , last4=Takakuwa , first4=Yuji , year=2003 , title=A possible spinosaurid tooth from the Sebayashi Formation (Lower Cretaceous), Gunma, Japan , url=https://www.researchgate.net/publication/313142817 , journal=

Bulletin of the Gunma Museum of Natural History Bulletin or The Bulletin may refer to: Periodicals (newspapers, magazines, journals) * Bulletin (online newspaper), a Swedish online newspaper * ''The Bulletin'' (Australian periodical), an Australian magazine (1880–2008) ** Bulletin Debate ...

, volume=7 , pages=1–5 Geologic formations of Japan Lower Cretaceous Series of Asia Cretaceous Japan Albian Stage Aptian Stage Barremian Stage Sandstone formations Shale formations Conglomerate formations Deltaic deposits Ichnofossiliferous formations Paleontology in Japan

Paleofauna

See also

References

Bibliography