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1989 Volume 46 Pages
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Article type: Appendix
1989 Volume 46 Pages
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1989 Volume 46 Pages
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Article type: Index
1989 Volume 46 Pages
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Masaki Takahashi, Hiroyuki Nagahama, Yuichiro Tanaka
Article type: Article
1989 Volume 46 Pages
1-9
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The strata distributed in the northeastern part of the Chichibu Basin represent a part of the lower part of the Chichibu Neogene rocks within the Basin in the Kanto Mountains. These rocks overlie unconformably pre-Neogene basement rocks (Chichibu Paleozoic and Mesozoic strata and Atokura Formation) along a part of its western margin, but are largely in reverse fault contact with the Sambagawa metamorphic rocks along its eastern margin. The lower part of the Chichibu Neogene rocks in the study area is divided into the Ushikubitoge and Miyato Formations, in ascending order. These two formations are conformable to each other. Out of 17 samples collected from these formations 11 have yielded calcareous nannofossils indicating a late Early Miocene to early Middle Miocene age (CN3-4 calcareous nannofossil zones of Okada and Bukry (1980) or NN4-5 of Martini (1971)).
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Atsushi Matsuoka
Article type: Article
1989 Volume 46 Pages
11-16
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Radiolarian fossils have been newly discovered from the uppermost part (Koyamada Formation) of the Somanakamura Group in the eastern marginal zone of the Abukuma Mountains, northeast Japan. The radiolarian fauna contains Pseudodictyomitra sp. cf. P. carpatica (Lozyniak), Sethocapsa sp. cf. S. kaminogoensis Aita, Hemicryptocapsa capita Tan Sin Hok, and so on. This association indicates an early Early Cretaceous age. The age assignment is consistent with that by ammonites (Berriasian).
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Takashi Okamoto
Article type: Article
1989 Volume 46 Pages
17-28
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Ikuwo Obata
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1989 Volume 46 Pages
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[in Japanese]
Article type: Article
1989 Volume 46 Pages
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S. Sakagami
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1989 Volume 46 Pages
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Y. Takayanagi
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1989 Volume 46 Pages
32-33
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Noriyuki Ikeya, Masamichi Shiozaki
Article type: Article
1989 Volume 46 Pages
34-38
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Article type: Appendix
1989 Volume 46 Pages
39-44
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1989 Volume 46 Pages
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Article type: Appendix
1989 Volume 46 Pages
45-46
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Y. Takayanagi
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1989 Volume 46 Pages
47-49
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1989 Volume 46 Pages
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Article type: Cover
1989 Volume 46 Pages
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1989 Volume 46 Pages
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