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Lower part

• Volcanic rocks
• late Miocene
• Contemporaneous heterotopic facies: upper Tsuma Formation

• Lithofacies: Rhyolite lava, Trachyte lava, Pyroclastic rocks

• Upper limit: Unconformity (Dairyo Trachyte)

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

• Distribution: 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.)