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Oku-kita Basalt Yamauchi et al., 2005

• Type locality: The cape at north-northeast of Oku, Okinoshima city, Oki county, Shimane prefecture
• Volcanic rocks
• Pliocene (3.6, 3.3 Ma, K-Ar)

• Sedimentary facies: Lava
• Sedimentary facies (Minor): Volcanic neck, Lava dome
• Lithofacies: Alkaline olivine basalt, Trachybasalt

• Distribution (Volcanic neck, Major axis): ca. 50 - 70 m
• Thickness: ca. 70 m
• Lower limit: Unconformity (Tokihariyama Formation, Kori Formation)

• Distribution: Oku - Kuboro - Kuroshima island, 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.)