男鹿半島北東部潟西地域における潟西層

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タイトル別名
  • Katanishi Formation in the Katanishi area, Oga Peninsula, Northeast Honshu, Japan
  • オガ ハントウ ホクトウブ カタ ニシ チイキ ニ オケル カタ ニシ ソウ

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抄録

The Pleistocene Katanishi Formation is distributed in the Katanishi area of the north-eastern part of the Oga Peninsula. It unconformably overlies the Anden Formation and consists mainly of loose sand and gravel, which are almost horizontal. The type Katanishi Formation is subdivided into four members: the Tarusawa Sand Member, Kakumazaki Mud Member, Matsukizawa Sand and Gravel Member, and Honnai Sand Member (Table 1). The Kakumazaki Mud Member conformably overlies the Tarusawa Sand Member and probably interfmgers with the Matsukizawa Sand and Gravel Member. The Honnai Sand Member, the uppermost member of the formation, covers the Matsukizawa Sand and Gravel Member with conformity. The Kamayachi Formation of HUZIOKA and TAKAYASU (1965) is a fossiliferous sand facies in the basal part of the Matsukizawa Sand and Gravel Member directly overlying the basement rocks, so it is here named the Kamayachi Facies of the Katanishi Formation. The Tarusawa Sand Member yielded cool shallow marine molluscs and the Kakumazaki Mud Member brackish water mollusca Crassostrea sp. The molluscan assemblage of the Kamayachi Facies shows that the Matsukizawa Sand and Gravel Member deposited in a warm, nearshore shallow sea. Pollen analysis (Fig. 6) indicates warm climate during deposition of the Kakumazaki Mud and Honnai Sand Members. The Katanishi Formation is composed mainly of warm, shallow marine and brackish water sediments. Stratigraphy and geographic distribution of the sedimentary facies of the Katanishi Formation indicate a set of off-shore bar and lagoon behind it, which had grown from sand and gravel beach with rise of sea level. The depositional surface of the formation coincides with the Katanishi Terrace Plain 40-60 m above sea level, which represents the the last major high stand of sea level. The Katanishi Formation is a correlative with deposits of the Last Interglaciation.

収録刊行物

  • 地球科学

    地球科学 37 (2), 69-80, 1983

    地学団体研究会

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