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Dozen volcano
- Volcanic rocks
- Caldera volcano
- late Miocene
- Lithofacies: Trachyte, Trachybasalt
- Distribution (Diameter): ca. 14 km
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Chiburijima island, Chibu city, Oki county, Shimane pref.; Nishinoshima island - Kaburijima island, Nishinoshima city, Oki county, Shimane pref.; Nakanoshima island - Takeshi port, Ama city, Oki county, Shimane pref.
- Chiba et al. (2000) Geology of the Urago District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 74p. (in Japanese with English abstract 3p.)