Classification and Correlation of Shin shu Loam in the South Shinshu Tephrogenetic Region, Central Japan
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This is a preliminary report of somewhat an essential part of tephrochronological study mainly made in the Ina valley since the last publication of our paper (KOBAYASHI and SHIMIZU, 1962). Tephrochronological study thus being carried in this district and its environs presents for further studies such many clues as micro- and mega-fossil flora closely associated with tephra horizons. These clues may permit us to get detail chronological and climatological informations from the Quaternary events in these districts. Our study has been advanced through only stratigraphic works, except for a few radiocarbon dates obtained from very limited samples. The purpose of the present paper includes the presentation of a chronological base for further studies. Anyhow, it is stressed from our study that no indications of warmer climate have been detected within a sequence of deposits younger than the period when the Wakamiko-Shinmachi plant beds were deposited. Additionally, the Pm-I has well been traced into the Shimosueyoshi Loam which conformably covers the surface of the Shimosueyoshi formation-a transgressive deposit (KOBAYASHI, 1965 a, b). Hence, the Shimosueyoshi marine transgression should be understood as the last major transgression having occurred during Pleistocene time. Exact stratigraphic situation of the Older Loam unit has remaind for future studies, owing to a few exposures and an intensive weathering of primary minerals contained in it. We have obligations to record kind helps offerred by two geobotanists, Dr. K. SUZUKI, Department of Geology, Fukushima University, and Dr. S. KOKAWA, Department of Botany, Osaka City University. We are also indebted to Mr. Y. GOHARA of our Department of Geology, and to Dr. S. KAWACHI, Mr. T. KOBAYASHI, Mr. K. KITAZAWA, and Mr. T. NASU for their cooperation.
- the Faculty of Liberal Arts and Science Shinshu Universityの論文
- 1965-12-30
the Faculty of Liberal Arts and Science Shinshu University | 論文
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