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Hakii Interbeds of Sandstone and Mudstone Member (Matsuda, 1958) Ozaki and Sugiyama, 2018

Invalid synonym: Tsunouchi Member, Arayashiki Member, Shiozawa Member, Mitsuishi Member, Hayakawabashi Member, Umedaira Member

• Type locality: Fujikawa river, Hakii, Minobu city, Minamikoma county, Yamanashi prefecture
• Coherent formation
• late Miocene - Pliocene
• Correlation (Upper): Fukushi Member
• Correlation: upper Utsubuna Member, upper Takatori Volcaniclastic Rocks, Sandstone and Mudstone Member?

• Sedimentary facies: Marine
• Sedimentary facies: Inter-channel deposit in the vicinity of submarine channels
• Lithofacies: Mudstone, Interbedded sandstone and mudstone
• Lithofacies (Minor): Sandstone, Andesite- basalt lapilli tuff, Tuff breccia, Volcanic conglomerate, Tuffaceous sandstone, Lava, Dacite tuff, Lapilli tuff
• Sedimentary structures: Parallel stratification

• Thickness: ca. 1,100 - 1,800 m
• Upper limit: Conformity (Seigo Volcaniclastic Member, Yorihata Member)
• Lower limit: Conformity (Yagisawa Mudstone Member, Marutaki Conglomerate Member)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Hakii - Ono - Umedaira - Seigo - Mitsukozawa - Kazone, Minobu city, Minamikoma county, Yamanashi pref.; Nakano - Nanbu - Owa, Nanbu city, Minamikoma county, Yamanashi pref.
• Fossils: Sponges (Sagarites sp.)
• Fossils (Foraminifera): Operculina ammonoides

• Ozaki and Sugiyama (2018) Geology of the Minobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 169p. (in Japanese with English abstract 7p.)
• Sugiyama and Matsuda (2014) Geology of the Nanbu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 134p. (in Japanese with English abstract 5p.)