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Shimoganya Basalt Yamauchi et al., 2005

• Volcanic rocks
• Pliocene (2.39, 2.35 Ma, K-Ar)

• Lithofacies: Olivine basalt lava
• Sedimentary structures: Columnar joint

• Thickness: ca. 80 m
• Lower limit: Unconformity (Tokihariyama Formation, Kori Formation)

• Distribution: Nakamura port, 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.)