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Ono Formation Yamamoto, 1999
Invalid synonym: Yunokami Formation
- Type locality: Aga river, Osawa, Shimogo city, Minamiaizu city, Fukushima prefecture
- Volcanic rocks
- Collapse caldera-fill deposit
- Miocene
- Sedimentary facies: Terrestrial
- Lithofacies (Intrusive rocks): Orthopyroxene clinopyroxene dacite
- Lithofacies (Debris avalanche): Breccia
- Ono Formation
- [ Upper ]
- ~~~~~~~~~~~~~~
- Intrusive rocks = Post-caldera stage
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- Kumado Pyroclastic Flow Deposit / Debris avalanche deposit = Caldera-forming stage
- ~~~~~~~~~~~~~~
- [ Lower ]
- Ono caldera
- [ Upper ]
- ~~~~~~~~~~~~~~
- Ono Formation
- ~~~~~~~~~~~~~~
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Aga river, Osawa, Shimogo city, Minamiaizu city, Fukushima pref.; Ono - Ashinohara, Shimogo city, Minamiaizu county, Fukushima pref.
- Yamamoto (1999) Geology of the Tajima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 8p.)