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Otsuka Formation Ishii et al., 1982

Invalid synonym: Yagami Formation, Shukuura Formation, Takagi Formation, Rikuzenotsuka Formation, Urato Formation

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