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Sogo Alternation of Tuffaceous Sandstone and Mudstone Member (Ikebe et al., 1951) Sumi et al., 1989

Invalid synonym: Miyajima Member, Tsuboike Member

• Type locality: Kinokubo, Tsubata city, Kahoku county, Ishikawa prefecture - Kono, Fukuoka town, Takaoka city, Toyama prefecture
• Coherent formation
• Miocene
• Contemporaneous heterotopic facies: Upper Shingu Sandstone and Conglomerate Member

• Sedimentary facies: Marine
• Sedimentary facies: Continental shelf
• Lithofacies (Upper): Tuffaceous sandstone, Tuff
• Lithofacies (Upper, Minor): Mudstone, Gravel-bearing sandstone
• Lithofacies (Lower): Silty mudstone
• Lithofacies (Lower, Minor): Tuff, Sandstone, Interbedded sandstone and mudstone

• Thickness: ca. 200 - 250 m
• Upper limit: Conformity (Goi Mudstone Member)
• Lower limit: Conformity (Lower Shingu Sandstone and Conglomerate Member)

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

• Distribution: Kinokubo - Niwatorizaka pass, Tsubata city, Kahoku county, Ishikawa pref.; Kono, Fukuoka town, Takaoka city, Toyama pref.; Tsuboike, Himi city, Toyama pref.; Konadegawa river, Oyabe city, Toyama pref.
• Fossils (Foraminifera): Miogypsina kotoi, Operculina complanata

• Sumi et al. (1989) Geology of the Isurugi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 118p. (in Japanese with English abstract 5p.)
• Sumi (1978) Geology of the Tsubata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 55p. (in Japanese with English abstract 4p.)