Correlation based on key tephra layers between the Ofuna-Koshiba Formations in the Yokohama district and the Kiwada Formation in the Boso Peninsula, central Japan.
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Accession number;03A0248670
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| Title;Correlation based on key tephra layers between the Ofuna-Koshiba Formations in the Yokohama district and the Kiwada Formation in the Boso Peninsula, central Japan. |
| Author;
FUJIOKA MICHIAKI
(Chiba Univ., Fac. Sci., JPN)
KAMEO KOJI
(Chibadai Kaiyobaioshisutemukense)
KOTAKE NOBUHIRO
(Chiba Univ., Fac. Sci., JPN)
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Journal Title;Journal of the Geological Society of Japan
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Journal Code:F0528A
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ISSN:0016-7630
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VOL.109;NO.3;PAGE.166-178(2003)
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| Figure&Table&Reference;FIG.10, TBL.2, REF.24 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;New evidence for correlation of three key tephra layers in the Quaternary strata between the Yokohama district and the Boso Peninsula, central Japan is provided. Strong coincidence of petrographic and chemical characteristics of tephra layers clearly demonstrates that the Sg3 tephra layer in the Ofuna Formation and the Sg2 and Sg3 tephra layers in the Koshiba Formation in the Yokohama district can be correlated with the Kd38, Kd25 and Kd24 key tephra layers in the Kiwada Formation in the Boso Peninsula, respectively. Biostratigraphic datums of calcareous planktons in the Ofuna-Koshiba Formations also support this result. Our study indicates that previous correlation of the Quaternary strata between the Yokohama district and the Boso Peninsula should be re-considered and detailed chronological studies of them will be needed in order to reconstruct basin evolution around the Kanto region during the Quaternary. (author abst.) |
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