Biostratigraphy and depositional facies of the Cretaceous in the upper reaches of the Haboro River, Hokkaido

Toshimitsu, Seiichi

doi:10.5575/geosoc.91.599

Cited by 22 publications

(28 citation statements)

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“…Yokoyamaoceras ishikawai Toshimitsu (1985Toshimitsu ( , 1988 Moriya and Hirano (2001) Okamoto et al (2003) This study , ; cf…”

Section: Cordiceramus Kawashitaimentioning

confidence: 99%

“…The Yezo Group is overlain unconformably by the Eocene Sankebetsu Formation (lower part) in the Haboro area and by the Miocene Jugosenzawa Formation in the Obira area. The lithostratigraphy in both areas was discussed by Igi et al (1958), Tsushima et al (1958), Tanaka (1963), Yamaguchi and Matsuno (1963), Toshimitsu (1985Toshimitsu ( , 1988, Okamoto et al (2003), Funaki and Hirano (2004), Takashima et al (2004), and Oizumi et al (2005). The Yezo Group has been subdivided into many lithostratigraphic units in northern Hokkaido (Igi et al 1958;Tanaka 1963;Tanabe et al 1977).…”

Section: Geological Settingmentioning

confidence: 99%

“…Solid lines represent the lowest occurrence of bivalve or ammonoid. Macrofossil data after Tanabe et al (1977), Matsumoto et al (1981), Sekine et al (1985), Toshimitsu (1985Toshimitsu ( , 1988, Asai and Hirano (1990), Moriya and Hirano (2001), , Okamoto et al (2003), Funaki and Hirano (2004) and Oizumi et al (2005) …”

Section: Stratigraphic Distributions Of Inoceramids Stratigraphic Dismentioning

confidence: 99%

“…The Saku and Haborogawa formations have yielded well-preserved and abundant macro-and microfossils (Tanaka 1963;Tanabe et al 1977;Sekine et al 1985;Toshimitsu 1985, 1988, Toshimitsu et al 1998Okamoto et al 2003;Funaki and Hirano 2004;Oizumi et al 2005). The upper Turonian through to lower Campanian is documented.…”

Section: Geological Settingmentioning

confidence: 99%

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A revised inoceramid biozonation for the Upper Cretaceous based on high-resolution carbon isotope stratigraphy in northwestern Hokkaido, Japan

Hayakawa¹,

Hirano²

2013

Acta Geologica Polonica

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ABSTRACT:Hayakawa, T., Hirano, H. 2013. A revised inoceramid biozonation for the Upper Cretaceous based on high-resolution carbon isotope stratigraphy in northwestern Hokkaido, Japan. Acta Geologica Polonica, 63 (2), 239-263. Warszawa.Biostratigraphic correlations of inoceramid bivalves between the North Pacific and Euramerican provinces have been difficult because the inoceramid biostratigraphy of the Japanese strata has been based on endemic species of the northwest Pacific. In this study, carbon stable isotope fluctuations of terrestrial organic matter are assembled for the Upper Cretaceous Yezo Group in the Haboro and Obira areas, Hokkaido, Japan, in order to revise the chronology of the inoceramid biozonation in Japan. The carbon isotope curves are correlated with those of marine carbonates in English and German sections with the aid of age-diagnostic taxa. According to the correlations of the carbon isotope curves, 11 isotope events are recognised in the sections studied. As a result of these correlations, the chronology of the inoceramid biozones of the Northwest Pacific has been considerably revised. The revised inoceramid biozones suggest that the timing of the origination and extinction of the inoceramids in the North Pacific biotic province is different from the stage/substage boundaries defined by inoceramids, as used in Europe and North America.

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“…Yokoyamaoceras ishikawai Toshimitsu (1985Toshimitsu ( , 1988 Moriya and Hirano (2001) Okamoto et al (2003) This study , ; cf…”

Section: Cordiceramus Kawashitaimentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Stratigraphic Distributions Of Inoceramids Stratigraphic Dismentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

See 2 more Smart Citations

A revised inoceramid biozonation for the Upper Cretaceous based on high-resolution carbon isotope stratigraphy in northwestern Hokkaido, Japan

Hayakawa¹,

Hirano²

2013

Acta Geologica Polonica

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“…The outcropping strata of these localities belong to the upper part of the Upper Yezo Group (locally called the Upper Haborogawa Formation). They are assigned to the upper part of the Inoceramus japonicus Zone (probably upper most Santonian to lowest Campanian) (Toshimitsu, 1985). Concluding remarks.…”

mentioning

confidence: 99%

A new inoceramid (bivalvia) species from the Upper Cretaceous of Hokkaido.

Toshimitsu

1986

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

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Polymorphism in Late Cretaceous phylloceratid ammonoids: evidence from ontogenetic trajectories of septal spacing

Iwasaki

Wani

2019

Papers in Palaeontology

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The ontogenetic trajectories of septal spacing between succeeding chambers of two phylloceratid ammonoids, Hypophylloceras subramosum and Phyllopachyceras ezoense, from the Haboro and Kotanbetsu areas, north‐western Hokkaido, Japan, were analysed. The ontogenetic trajectories of septal spacing of H. subramosum demonstrate a general trend with large intraspecific variation: two cycles of increasing to decreasing spacing followed by almost constant spacing. The large intraspecific variation can be subdivided into three types, making this species polymorphic. The ontogenetic trajectories of septal spacing of P. ezoense also show intraspecific variation, but with a different trend: one cycle of increasing to decreasing spacing and an increasing trend after that. The intraspecific variation can be subdivided into two types, which suggests that this species is dimorphic, possibly sexually dimorphic. Dimorphism is supported by two observations: (1) the difference in the ontogenetic trajectories of septal spacing is only seen in the later ontogenetic stages; and (2) the two types co‐occur with comparable abundance throughout all stratigraphic horizons. Detailed analyses of ontogenetic trajectories of septal spacing may reveal polymorphism in other ammonoid clades.

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Biostratigraphy and depositional facies of the Cretaceous in the upper reaches of the Haboro River, Hokkaido

Cited by 22 publications

References 0 publications

A revised inoceramid biozonation for the Upper Cretaceous based on high-resolution carbon isotope stratigraphy in northwestern Hokkaido, Japan

A revised inoceramid biozonation for the Upper Cretaceous based on high-resolution carbon isotope stratigraphy in northwestern Hokkaido, Japan

A new inoceramid (bivalvia) species from the Upper Cretaceous of Hokkaido.

Polymorphism in Late Cretaceous phylloceratid ammonoids: evidence from ontogenetic trajectories of septal spacing

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