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Otogawa Formation (Fujita and Nakagawa, 1948) Shimizu and Fujii, 1995

Invalid synonym: Otogawa Group

Mita Formation and Tenguyama Formation had been included in Otogawa Formation.

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