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Palaeontology and stratigraphy of the inoceramid species from the mid-Turonian through upper Middle Coniacian in Japan
Upper Cretaceous strata are weIl exposed in many areas of Japan, although good exposures through the Turonian/Coniacian boundary are not common. This paper focuses on six areas in Hokkaido, ShikokuExpand
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The Ancestry of the Genus Nautilus
The genus Nautilus is known to be represented by at least six extant species that inhabit a well-circumscribed large area in the southwestern Pacific Ocean, the Philippines, Indonesia, and theExpand
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Integrated biostratigraphic and radiometric study on the Lower Cenomanian (Cretaceous) of Hokkaido, Japan
New 4 0 Ar- 3 9 Ar total fusion ages have been obtained on sanidine from tuffs in the zone of Mantelliceras saxbii (equivalent to the same subzone of the European ammonite zonation) and the zone ofExpand
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The Yezo Group and the Kwanmon Group
Bearing in mind the rule of the stratigraphical nomenclature, which is now under discussion among the Japanese geologists, I am going to propose the new name of the Japanese Cretaceous formations.,Expand
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