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( Invalid ) Iwadono Formation Koike et al., 1985

Corresponds to Godo Formation, Negishi Formation, and Shogunzawa Formation.

• Upper limit: Conformity (Ohashi Formation)
• Lower limit: Unconformity (Kamikarako Formation)

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

• Koike et al. (1985) Jour. Geol. Soc. Japan, vol.91, no.10, pp.665-677.