Stratigraphic revision of the Miocene<b>“</b> Saikawa Formation<b>”</b> distributed in the southern Kanazawa area, Ishikawa Prefecture, central Japan.

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  • Yamada Toshihiro
    School of Natural System, College of Science and Engineering, Kanazawa University
  • Teduka Shota
    School of Natural System, College of Science and Engineering, Kanazawa University
  • Kamiya Takahiro
    School of Natural System, College of Science and Engineering, Kanazawa University
  • Yanagisawa Yukio
    AIST, Geological Survey of Japan, Research Institute of Geology and Geoinformation

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Other Title
  • 金沢市南部に分布する中新統“犀川層”の層序学的再検討
  • カナザワシ ナンブ ニ ブンプ スル チュウ シントウ"サイガワソウ"ノ ソウ ジョガクテキ サイケントウ
  • Stratigraphic revision of the Miocene “Saikawa Formation” distributed in the southern Kanazawa area, Ishikawa Prefecture, central Japan

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Abstract

<p>The stratigraphy of the Miocene “Saikawa Formation” distributed in the southern Kanazawa area, Ishikawa Prefecture, is revised based on litho- and biostratigraphic studies. The previously defined “Saikawa Formation” is divided here into the Yamashina, Saikawa (redefined), and Koderayama formations in ascending order. The Yamashina Formation consists mainly of mudstone and contains diatoms which indicate ca.15.6–15.4 Ma within the diatom zone NPD4A. The Saikawa Formation is composed mainly of coarse-grained sandstone and the obtained diatoms were considered to be reworked. However, calcareous nannofossils of the zone CN5a (13.6–11.8 Ma) were reported from the Saikawa Formation in a previous study. These data indicate that the Saikawa Formation unconformably overlies the Yamashina Formation. The Koderayama Formation is characterized mainly by fine-grained sandstone with a basal conglomerate bed eroding the upper part of the Saikawa Formation. The Koderayama Formation in turn is eroded by a conglomerate bed of the overlying Pleistocene Omma Formation. The Koderayama Formation includes endocarps of Carya (Juglandaceae) which became extinct in Japan before 3 Ma. Therefore, the Omma Formation should unconformably overlie the Koderayama Formation with a sedimentary hiatus of more than 1.3 million years.</p>

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