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Sugawa Formation Niigata University Reseach Group of Geology in Higashikubiki District, 1987

Takeuchi et al. considered Sugawa Formation is a part of Takegahana Formation.

Invalid synonym: Yokozumi Formation, Kiwadahara Formation

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