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Oharakokushoku Lava
- Volcanic rocks
- early Pleistocene
- Lithofacies (Upper): Explosion breccia
- Lithofacies: Lava
- Lithofacies (Lower): Tuff breccia
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Maiko skii field, Yuzawa city, Minamiuonuma county, Niigata pref.
- Chihara et al. (1981) Geology of the Echigo-Yuzawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 108p. (in Japanese with English abstract 8p.)