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Ogikubo Formation (Suzuki, 1938) Nagamori et al., 2003

Invalid synonym: Ogikubo Sandy Mudstone Member, Shimokusukawa Formation

It had been treated as a member of Shigarami Formation.

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