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S4 Bed
- Coherent formation
- Miocene
- Lithofacies: Mudstone, Interbedded sandy tuff and mudstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Oya village, Utsunomiya city, Tochigi pref.
- Matsui et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.89-102 DOI