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Oarasawa Formation Ijiri, 1941

Invalid synonym: Isawagawa Formation (Iwate pref. side), Kuwanokizawa Formation (Akita pref. side)

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