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2014 Volume 95 Pages
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Tatsuo Oji, Masayuki Oishi
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2014 Volume 95 Pages
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Article type: Index
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Shigeo Usui, Keiichi Takahashi, Yuji Abe, Midori Matsumoto
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2014 Volume 95 Pages
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The coronal sutures of nine specimens representing eight species of Japanese three pointed deer from the Pliocene-Pleistocene were investigated. Patterns of the coronal sutures are clearly observed in six specimens representing five species: Cervus praenipponicus from Kawasaki and Ichihara, C. akiyoshiensis from Mine, C. kazusensis from Otsu, C. shimabarensis from Minamishimabara and an unidentified specimen from Taga. It is advantageous to paleontology that the coronal sutural patterns are observable even in fragmentary fossil specimens. Combined with morphology of antlers, it is useful for classification of three pointed deers. The sutures of C. praenipponicus, C. kazusensis and C. shimabarensis are "W"- shape or open pentagonal shape expanding to the rostrad. In contrast, the suture of the Taga specimen exhibits a "V" -shape curve. Therefore, at least two groups are discriminated in Pliocene-Pleistocene three pointed deer species inhabited Japanese Islands. The "W" -shape suture is well observed in the extant Cervinae C. unicolor, C. nippon and C. elaphus, while the "V" -shaped type is seen in C. timorensis, C. eldi, Axis porcinus, Dama dama and Elaphurus davidianus. The Japanese three pointed deer species having the "W" -shaped sutures are closely related to C. unicolor. On the other hand, the Taga specimen having a "V" -shaped suture is supported the relation to C. timorensis or A. porcinus. It conflicts with the general arguments on Cervinae that A. porcinus is not closely related to C. unicolor or C. timorensis. The Taga specimen needs further reaserch utilizing other skeletons from the same locality to determine its taxonomic position.
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Bun-ya Honda, Hiromichi Hirano
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2014 Volume 95 Pages
19-37
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This paper describes the stable carbon isotope stratigraphy and megafossil biostratigraphy of the Upper Cretaceous Yezo Group in the Obira area, Hokkaido, northern Japan. In the present study, carbon isotopes were measured from kerogens in mudstone and sandy mudstone. The composition and thermal maturation of the kerogens were evaluated in detail. Results show that the carbon isotope curves are correlated with those of marine carbonate in the English Chalk sections. The correlations between these carbon isotope curves demonstrate the existence of three isotope events in the sections studied. These results revise the geologic age based on the inoceramid biozonation in Japan. Three zones are able to established in this section ascending stratigraphic order: the Inoceramus uwajimensis Interval Zone, the Inoceramus amakusensis Interval Zone, and the Platyceramus japonicus Interval Zone. These zones are able to correlated with the Upper Turonian to the Coniacian, the Coniacian to the Lower Campanian, and the Lower Campanian, respectively.
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Shiro Hasegawa
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2014 Volume 95 Pages
39-41
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[in Japanese]
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