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Ikumo Caldera
Invalid synonym: Ikumo cauldron
- Asymmetric collapse caldera (piecemeal-type and trapdoor-type)
- Volcanic rocks
- Late Cretaceous
- Distribution (East-West): 11 km
- Distribution (South-North): 16 km
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Yamaguchi pref.
- Imaoka et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.7, pp.529-553 DOI