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Soni Formation
- Type locality: Soni city, Uda county, Nara prefecture
- Coherent formation
- middle Miocene
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Shimotaguchi, Uda city, Nara pref.; Byobu-iwa, Soni city, Uda county, Nara pref.; Mount Amagatake, Tsu city, - Iga city, Mie pref.
- Sato et al. (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.53-69 DOI