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Younger ring dike
- Type locality: Yamaguchi city, Yamaguchi prefecture
- Ring dike by the 2nd collapse of the caldera
- Intrusive rocks
- Cretaceous
- Lithofacies: Quartz porphyry, Granite porphyry, Intrusive breccia
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Yamaguchi city, Yamaguchi pref.
- Kishi et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.9, pp.479-491 DOI