The Hakobuchi Formation is a geological formation in Hokkaido, Japan. It is the uppermost unit of the Yezo Group, being early Maastrichtian in age. It consists of bioturbated glauconitic sandstones, siltstones and conglomerates with coaly mudstone and minor tuffite. It was deposited in a continental shelf setting.[1] It is noted for its fossil content with the invertebrates mainly consisting of bivalves and ammonites. With vertebrates including the mosasaurs Mosasaurus hobetsuensis and Phosphorosaurus ponpetelegans.[2] As well the sea turtle Mesodermochelys[3] and the hadrosaurid dinosaur Kamuysaurus.[4]
^Takashima, Reishi; Kawabe, Fumihisa; Nishi, Hiroshi; Moriya, Kazuyoshi; Wani, Ryoji; Ando, Hisao (June 2004). "Geology and stratigraphy of forearc basin sediments in Hokkaido, Japan: Cretaceous environmental events on the north-west Pacific margin". Cretaceous Research. 25 (3): 365–390. doi:10.1016/j.cretres.2004.02.004. hdl:2115/17182.
^Konishi, Takuya; Caldwell, Michael W.; Nishimura, Tomohiro; Sakurai, Kazuhiko; Tanoue, Kyo (2016-10-02). "A new halisaurine mosasaur (Squamata: Halisaurinae) from Japan: the first record in the western Pacific realm and the first documented insights into binocular vision in mosasaurs". Journal of Systematic Palaeontology. 14 (10): 809–839. doi:10.1080/14772019.2015.1113447. ISSN 1477-2019.
^Hirayama R, Chitoku T. (1996). "Family Dermochelyidae (Superfamily Chelonioidea) from the Upper Cretaceous of North Japan". Transactions and proceedings of the Palaeontological Society of Japan. New series184: 597-622. online, retrieved 28 July 2008
^Sakurai, Kazuhiko; Sato, Tamaki; Chinzorig, Tsogtbaatar; Tanaka, Kohei; Fiorillo, Anthony R.; Chiba, Kentaro; Takasaki, Ryuji; Nishimura, Tomohiro; Kobayashi, Yoshitsugu (September 5, 2019). "A New Hadrosaurine (Dinosauria: Hadrosauridae) from the Marine Deposits of the Late Cretaceous Hakobuchi Formation, Yezo Group, Japan". Scientific Reports. 9 (1): 1–14. doi:10.1038/s41598-019-48607-1. PMC 6728324. PMID 31488887.
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The HakobuchiFormation is a geological formation in Hokkaido, Japan. It is the uppermost unit of the Yezo Group, being early Maastrichtian in age. It...
Late Cretaceous Maastrichtian marine deposits of the Yezo Group (HakobuchiFormation) in the Hobetsu area near the town of Mukawa, Hokkaido in Japan....
Phosphorosaurus ortliebi, from the Craie de Ciply Formation in Belgium, and P. ponpetelegans, from the HakobuchiFormation of Hokkaido in Japan. P. ponpetelegans...
Ophiolite. The sequence gradually shallows upwards with the terminal HakobuchiFormation representing a fluvial-inner shelf environment. Numerous fossils...
(Dinosauria: Hadrosauridae) from the Marine Deposits of the Late Cretaceous HakobuchiFormation, Yezo Group, Japan". Scientific Reports. 9 (1): 12389. Bibcode:2019NatSR...
ankylosaurian dinosaur Bienosaurus lufengensis from the Lower Lufeng Formation of Yunnan, China". Acta Palaeontologica Polonica 64 Alifanov, V. R.; Saveliev...
(Dinosauria: Hadrosauridae) from the Marine Deposits of the Late Cretaceous HakobuchiFormation, Yezo Group, Japan". Scientific Reports. 9 (1): 12389. Bibcode:2019NatSR...
(Dinosauria: Hadrosauridae) from the marine deposits of the Late Cretaceous HakobuchiFormation, Yezo Group, Japan". Scientific Reports. 9 (1): Article number 12389...
Hobetsu Museum (HMG) 5 was collected in 1980 from the Maastrichtian HakobuchiFormation (Yezo Group) in Inasato, Hobetsu, Hokkaido, Japan. It comprises a...
species of Mosasaurus (Reptilia; Squamata) from the Upper Cretaceous Hakobuchi Group in central Hokkaido, Japan.". In Goto; et al. (eds.). Evolution...