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Shonai Tuff Member Kutsuzawa et al., 1966

• Type locality: Shonai creek, Kyowa, Daisen city, Akita prefecture
• Tephra
• Miocene
• Contemporaneous heterotopic facies: Middle - Lower Main part

• Lithofacies: Acidic lapilli tuff, Tuff
• Lithofacies (Minor): Mudstone, Sandstone, Basalt lapilli tuff, Tuff, Conglomerate

• Thickness: 0 - 300 m

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

• Distribution: Shonai creek - Miyatamata creek - Okura creek, Kyowa, Daisen city, Akita pref.; Uyashinai, Kawabe, Akita city, Akita pref.

• Ozawa et al. (1981) Geology of the Taiheizan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 4p.)