赤坂石灰岩の地質学的研究(地学団体研究會創立十周年記念号)

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The Akasaka limestone, western part of Central Japan, yields abundant Permian fusulinids, that have been. studied by many students since 1874. Among those, Ozawa's work (1927) was so detail in his days, that fusulinid zones established by him have been recognized as a standard of the upper Permian of the world for a long time. However, many points in his work have lately been questioned, since the present writers undertook investigation of this limestone. As the results, the limestone may be subdivided into three divisions as follows. Lower division mainly consists of pale grey or white limestone, part below the first appearance of Neoschwagerina nipponica. Important fossils ……… Schwagerina japonica, Pseudoschwagerina ozawai and Verbeekina sphaera. Middle division mainly consists of dark grey limestone, part between the first appearance of N. nipponica and Yabeina igoi. Important fossils ……… Neoschwagarina nipponica, N. simplex, N. wakimizui, N. profunda, N. margaritae, N. skinneri. N. minoensis and so on. Upper division mainly consits of muddy black limestone, part above Yabeina igoi. Important fossils ……… Yabeina igoi, Y. katoi, Y. globosa, and Y cf. multiseptata. According to Ozawa, lower part of this limestone represents an isoclinal anticline in the eastern part. However, the writers did not recognize such structure, but observed that the limestone is cut by many faults and shows monoclinal and mozaic structures. The range cherts of the species of main fusulinids are prepared. Ozawa's D subzone (Pseudodoliolina subzone) is not refered to Nc zone (Neoschwagerina craticulifera zone), but a part of the lower division. Moreover, the writers recognize so-called Schwagerina zone below Neoschwagerina zone.
地学団体研究会の論文
1956-03-25

赤坂石灰岩の地質学的研究(地学団体研究會創立十周年記念号)

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