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Somachi Formation
- Type locality: Kagoshima prefecture
- Coherent formation
- Pliocene - early Pleistocene
- Sedimentary facies: Marine
- Shimajiri Group (Kikai island)
- [ Upper ]
- ~~~~~~~~~~~~~~~~
- Somachi Formation
- ?--?--?--?--?-
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kikai island, Kagoshima, Kagoshima pref.
- Nanjo et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.3, pp.155-170 DOI