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Saigo Basalt (Uchimizu, 1966) Yamauchi et al., 2009

Invalid synonym: Togo Gravel, Tsukinashi Basalt

• Type locality: Yabigawa river, Hatta - Saigo bay, Okinoshima city, Oki county, Shimane prefecture
• Volcanic rocks
• Pleistocene (0.82, 0.69, 0.63 Ma, K-Ar)
• Correlation: Daimanjisanminami Basalt

• Lithofacies (Top, Minor): Conglomerate, Olivine basalt lava
• Lithofacies: Trachybasalt lava
• Lithofacies (Basal): Conglomerate
• Sedimentary structures: Columnar joint

• Thickness: 30 - 100 m or thicker
• Upper limit: Unconformity (Higher I Terrace Deposits, Higher II Terrace Deposits)
• Lower limit: Unconformity (Ikeda Basalt, Oki Metamorphic Rocks, Kori Formation, Omosu Formation), Abut unconformity (Omosu Formation)

• Distribution: Hatta - Saigo bay - Yabigawa river - Arakigawa river - Togogawa river, Okinoshima city, Oki county, Shimane pref.

• Yamauchi et al. (2009) Geology of the Saigo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 118p. (in Japanese with English abstract 3p.)