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Toguhama Formation (Shibata and Fujita, 1966) Ishii et al., 1983

Minatohama Siltstone Member was included in Siltstone Member of Otsuka Formation by Ishii et al. (1983).

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