房総半島, 千畑礫岩層に含まれる有孔虫化石

• Main Authors: 大木, 良仁, 八田, 明夫, 石川, 秀雄, Ishikawa, Hideo, Hatta, Akio, Oki, Yoshihito
• Format: Report
• Language: Japanese
• Published: 千葉大学教育学部 1982
• Subjects: NDC:370; Inner Bay; Planktonic foraminifera
• Online Access: https://opac.ll.chiba-u.jp/da/curator/900025058/; https://opac.ll.chiba-u.jp/da/curator/900025058/KJ00004299317.pdf

The Senhata Formation is distributed in the southern part of Boso Peninsula, Central Japan. The formation consists of conglomerate containing cobblestones of various sedimentary rocks, igneous rocks and crystalline schists, and contains many foraminiferal fossils. In this study foraminiferal fossils from the Senhata Formation were investigated geologically and paleontologically. The results obtained are as follows: (1) Judging from the ranges of the planktonic foraminifera, the age of Senhata Formation may correspond with the middle part of N.17 to the latest of N.18 of Blow's zonation scheme (1969). ( 2 ) The planktonic ratio of the assemblage and the benthonic foraminiferal fauna indicate the paleo-environment of the shallow water and inner bay conditions.