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Hachiya Formation
- Coherent formation
- First Seto Inland Sea
- Sedimentary basin in island arc
- early Miocene
- Sedimentary facies: Lacustrine
- Lithofacies: Mafic - intermediate pyroclastic rocks
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Shinjoe et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.7, pp.533-538 DOI
- Ina et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.10, pp.542-545 DOI