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Yanba Formation Kurasawa et al., 1985
- Coherent formation
- Early Pliocene
- Sedimentary facies: Terrestrial
- Lithofacies: Interbedded andesitic tuff breccia - volcanic breccia and andesitic lava
- Lithofacies (Minor): Tuffaceous sandstone
- Thickness: 400 m or thicker
- Upper limit: Unconformity
- Lower limit: Unconformity
- [ Upper ]
- ~~~~~~~~~~~~~~
- Yanba Formation
- ~~~~~~~~~~~~~~
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Azuma, Gunma pref.
- Nakamura et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.8, pp.397-412, DOI