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Otoge caldera
- Volcanic rocks
- Caldera volcano
- early Pliocene (ca. 4.9 - 4.8 Ma, K-Ar)
- Distribution (Diameter): ca. 10 km
- Otoge caldera
- [ Upper ]
- ~~~~~~~~~~~~~~
- Otoge Formation
- ~~~~~~~~~~~~~~
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Yamagata pref. - Fukushima pref.
- Furukawa et al. (2018) Geology of the Azuma Yama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 74p. (in Japanese with English abstract 3p.)