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2000 Volume 68 Pages
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Tatsuro Matsumoto, Tamio Nishida
Article type: Article
2000 Volume 68 Pages
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In connection with the global standard of the Albian-Cenomanian boundary which was proposed at Brussels in 1995 and has been under discussion, we are working on the biostratigraphy of the late Albianearly Cenomanian succession in selected areas of Hokkaido. In this paper a result of our study in the Shuparo Valley of central Hokkaido is presented. Although the clastic sedimentaries in the area are not necessarily prolific, some worldwide ammonoid species have been obtained at several horizons (see Figure 1), which are tentatively correlated with the subzones in West Europe (Table 1). The stage boundary can, thus, be placed approximately between the Members IIb 2 and IIc in this area. There is, however, a considerable difference in the faunules of successive subzones between Japan and West Europe. In comparison with the ammonite biostratigraphy, some comments are given on the previous results of the foraminiferal biostratigraphy in this area. There are layers of tuff at several levels in the succession of Hokkaido, which would be useful to supplement the biostratigraphic correlation.
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Hiromichi Hirano, Takashi Sakai, Kazuto Kodama, Toru Nakamori, Hisao A ...
Article type: Article
2000 Volume 68 Pages
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Seiichi Toshimitsu, Hiromichi Hirano, Takashi Matsumoto, Kazuharu Taka ...
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2000 Volume 68 Pages
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Hiroshi Nishi, Reishi Takashima, Takayuki Hatsugai, Atsuhito Ennyu, To ...
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2000 Volume 68 Pages
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Kazuto Kodama
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2000 Volume 68 Pages
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Hugh Jenkyns
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2000 Volume 68 Pages
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Kazuharu Takahashi, Hiromichi Hirano
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2000 Volume 68 Pages
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Yong Il Lee
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Takashi Hasegawa
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Marcos A. Lamolda
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2000 Volume 68 Pages
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Xiao Qiao Wan, Cheng Shan Wang
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2000 Volume 68 Pages
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Marcos A. Lamolda, Mihaela C. Melinte, Christopher R. C. Paul
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2000 Volume 68 Pages
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Toru Nakamori, Yasufumi Iryu
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Yoshinari Kawamura
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Hisayoshi Igo
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2000 Volume 68 Pages
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