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Zentoku Tuff Member Ozawa et al., 1979
- Type locality: Zentoku, Higashiyuri, Yurihonjo city, Akita prefecture
- Volcanic rocks
- early Miocene
- Contemporaneous heterotopic facies: Upper Hatamura Formation
- Lithofacies: Acidic tuff, Acidic welded tuff
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Zentoku, Higashiyuri, Yurihonjo city, Akita pref.
- Ozawa et al. (1979) Geology of the Asamai District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 53p. (in Japanese with English abstract 4p.)