秋田縣本莊盆地東部の新第三系
スポンサーリンク
概要
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1) The stratigraphic succession of the formation in the eastern part of Honjo Basin, Akita Prefecture, was established by the writer., The formations are comformable throughout the area., They are described from upper to lower as follows: Isizawagawa group Minaminomata formation: alternation of fine sandstone and gray mudstone (containing Sagarites) in the lowermost part (80m., + in thickness) Tate formation (about 450m., in thickness): black mudstone (containing Sagarites and smaller foraminifera) Toridame formation (250-400m., in thickness): hard mudstone and siliceous mudstone (containing Sagarites, fish bone and scale) Simogo group Sugota formation (100-200m., in thickness): conglomerate and sandstone (containing Sagarites, smaller foraminifera, mollusca, plants, lignite and silicified woods) Hatamura formation (80-200m., in thickness): green tuff and tuffaceous sandstone (containing plants, lignite and silicified woods) Kanotume formation (320-400m., in thickness): andesite lava, agglomerate and tuff Hisumiyama group Oyana formation (200-350m., in thickness): lithoiditic rhyolite tuff and tuffaceous shale (containing plants and lignite) Yamauti formation (300m., in thickness): andesite lava, agglomerate and tuff breccia 2) Hisumiyama and Simogo groups and the Toridame, Tate and Minaminomata formations in the area may be correlated approximately to the Takasegawa tuff beds, Onnagawa shale beds, Funakawa shale beds and Hosogoe shale beds of K., MURAYAMA (1934) respectively., 3) Some components of Aniai flora (Picea, etc.,) are contained in Oyana formation, and of Daizimaian flora (Liquidambar formosana, etc.,) in either Hatamura or Sugota formation., Sugota formation includes mollusca (Patinopecten kimurai, Chlamys cfr., kaneharai, etc.,) and smaller foraminifera (Lagenidae, Buliminidae, etc.,) which are characteristic to the formation., 4) Two similar cycles of volcanic activities, which begin with the eruption of andesite and end with the eruption of rhyolite, are recognized in both Hisumiyama and Simogo group., The intense volcanic activities are also associated with the deposition of the lower part of Sugota formations, as well as with the upper part of Minaminomata formation.,
- 日本地質学会の論文
- 1954-05-25