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Article type: Cover
1995 Volume 58 Pages
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Article type: Appendix
1995 Volume 58 Pages
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Article type: Index
1995 Volume 58 Pages
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1995 Volume 58 Pages
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Hitoshi Furusawa
Article type: Article
1995 Volume 58 Pages
1-9
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Several specimens of Steller's sea-cow (Hydrodamals gigas) have been collected from the North Pacific region. These are, however, not enough to investigate intraspecific variation. As a result of study of the specimens newly found from the Bering Island and those kept at the Nikol'skoye Museum in the island, the author confirmed that all of the characters used in the cladistic analysis by Furusawa (1988) exhibit few variation among specimens and are appropriate for phylogenetic analysis.
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Yayoi Shinada, Kazutaka Amano
Article type: Article
1995 Volume 58 Pages
10-19
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From the lower Pleistocene strata in Japan Sea borderland, the following four species of rock-boring bivalves were obtained; Hiatella arctica (Linnaeus), Zirfaea subconstricta (Yokoyama), Penitella gabbii (Tryon) and Nettastomella japonica (Yokoyama). All these species are now living around Japanese Islands. Such a high extant rate is probably due to their endolithic life style. The Nettastomella and the Penitella-Zirfaea associations are recognized by the combination of above mentioned species. The southern limit of the Nettastomella association living around northern Hokkaido was situated at central Honshu in early Pleistocene. This distributional pattern and the low diversity of associations are attributed to the colder climate in those age than in the recent.
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Tomowo Ozawa, Keisuke Inoue, Susumu Tomida, Takaya Tanaka, Takami Nobu ...
Article type: Article
1995 Volume 58 Pages
20-27
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The chronologic and geographic distributions of the Neogene warm-water molluscan faunas in Japan are outlined in relation to the Neogene warm marine climatic events in the Pacific region. The Neogene warm-water molluscan faunas in Japan can be grouped by age into the following six successive phases each of which corresponds to a warm marine climatic event : 1) the Akeyo Fauna in Early Miocene (ca. 18.5-16.5 Ma); 2) the Kadonosawa Fauna in latest Early Miocene to early Middle Miocene (ca. 16.0(+)-15 Ma); 3) the Fujina Fauna in early Middle Miocene (ca. 14.5-13.5 Ma); 4) the Kukinaga Fauna in middle to late Middle Miocene (ca. 11.5-10 Ma); 5) the Zushi Fauna in late Late Miocene to early Early Pliocene (ca. 7-4.5 Ma); and 6) the Kakegawa Fauna in Late Pliocene to Early Pleistocene (ca. 3(+)-0.8 Ma). These faunas are characterized by the common occurrence of tropical and subtropical benthic and planktonic species along with warm temperate ones. They flourished under a strong influence of warm current at the time of a remarkable warming of marine climate in the Neogene Period. The warm events repeatedly made renewal of the faunal composition and finally have established the present-day Kuroshio Fauna. The subtropical molluscs of the Akeyo Fauna invaded from the south into the coastal waters in Eastern Asia during a major transgression in late Early Miocene. The Kadonosawa Fauna flourished during mid-Niogene climatic optimum that was termed as Climatic Optimum 1 (16-14.9 Ma) by Barron and Baldauf (1990). The Fujina Fauna existed under the restoration of marine warm climate after Climatic Optimum 1 (ca. 14.5-13.5 Ma). The age of the Kukinaga Fauna coincides with Climatic Optimum 2 (11.5-10.4 Ma) of Barron and Baldauf (1990), and the time interval of the Zushi Fauna corresponds to Climatic Optimum 3 (7.6-6.6 Ma). Tropical and subtropical species of the Kakegawa Fauna invaded from the south into the Japanese waters during the peak of the latest Neogene climatic optimum around 2 Ma. As a summury of our views, a new schema on the chronologic and geographic distributions of the Japanese Neogene and Quaternary shallow marine molluscan faunas is presented as a revised version of the previous syntheses based on our recent studies on the Neogene molluscan faunas in central and southwestern Japan.
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Mutsumi Fujimoto, Kimiyoshi Sada, Yukimasa Oho
Article type: Article
1995 Volume 58 Pages
28-36
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The Shimodani Limestone in the Oga upland in Okayama prefecture, western Japan, is composed of massive limestone with basic pyroclastic rocks at the base. This limestone is divisible into two foraminiferal zones in upward sequence : the Endothyra-Mediocris Zone and the Eostaffella-Millerella Zone. The former is characterized mainly by Endothyra exilis, E. similis, E. irinae, Endostaffella sp., Planoendothyra sp., Mediocris mediocris and M. adducta. The latter is composed of Eostaffella kanmerai, E. etoi, E. akiyoshiensis, E. mosquensis, E. ikensis, Millerella marblensis, Ozawainella japonica, Zellerinella discoidea and others. These two zones are regarded as ranging in age from the late Osagean to the early Morrowan in North America, and the early Visean to the late Serpukhovian in Russia. The Shimodani Limestone has a successive sequence without nonconformity, making a gentle basin structure, and thrust over the Upper Triassic Nariwa Group. The Shimodani Limestone is similar to the western and central parts of the Koyama Limestone in the lithofacies and the foraminiferal assemblages. Therefore, the Shimodani Limestone is considered to be the so-called klippe separated from the Koyama Limestone. This thrust fault has a large fracture zone, though the structure of the limestone is not disordered. This fact suggests that basic pyroclastic rocks of the Shimodani Limestone and coal beds of the Nariwa Group played an important role in its sliding surface.
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Itaru Hayami
Article type: Article
1995 Volume 58 Pages
37-40
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Kenshiro Ogasawara, Tamio Kotaka
Article type: Article
1995 Volume 58 Pages
41-43
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Ryoichi Tabuki, Takahiro Kamiya
Article type: Article
1995 Volume 58 Pages
44-46
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Yoichiro Takayanagi
Article type: Article
1995 Volume 58 Pages
47-48
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Yoichiro Takayanagi
Article type: Article
1995 Volume 58 Pages
49-50
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Itaru Hayami
Article type: Article
1995 Volume 58 Pages
51-52
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Article type: Appendix
1995 Volume 58 Pages
53-56
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1995 Volume 58 Pages
57-
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Article type: Appendix
1995 Volume 58 Pages
58-59
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Article type: Appendix
1995 Volume 58 Pages
59-
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Article type: Bibliography
1995 Volume 58 Pages
60-
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Article type: Appendix
1995 Volume 58 Pages
61-72
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1995 Volume 58 Pages
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Article type: Appendix
1995 Volume 58 Pages
73-81
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Article type: Bibliography
1995 Volume 58 Pages
82-83
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Article type: Appendix
1995 Volume 58 Pages
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1995 Volume 58 Pages
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Article type: Cover
1995 Volume 58 Pages
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1995 Volume 58 Pages
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