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Upper Oya Formation
- Coherent formation
- Miocene
- Lithofacies: Pumice lapilli tuff
- Upper Oya Formation (Oya, Tochigi pref.)
- [ Upper ]
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- I Bed
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- II Bed
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- III Bed
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- IV Bed
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- V Bed
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Oya village, Utsunomiya city, Tochigi pref.; Utsunomiya hills, Tochigi pref.
- Matsui et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.89-102 DOI