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Asakawa Formation (Suzuki, 1938)

Invalid synonym: Asakawa Mudstone Member, Shinkoji Formation

It had been treated as a member of Aoki Formation.

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