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Lower Oya Formation
- Coherent formation
- Miocene
- Lithofacies: Interbedded rhyolitic lapilli tuff, tuff and tuffaceous sandstone
- Lower Oya Formation (Oya, Tochigi pref.)
- [ Upper ]
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- VI Bed
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- S3 Bed
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- VII Bed
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- S4 Bed
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- VIII 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