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Chichibumachi Formation (Watabe et al., 1950) Makimoto and Takeuchi, 1992

Invalid synonym: Chichibumachi Group

Invalid synonym (Lower): Nagura Formation

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