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Hongo Formation
- Type locality: Gifu prefecture
- Coherent formation
- First Seto Inland Sea
- Sedimentary basin in island arc
- Miocene (19 - 18 Ma; 18.2 - 16.4 Ma, FT)
- Contemporaneous heterotopic facies: Akeyo Formation (Tsukiyoshi Member, Togari Member, Yamanouchi Member)
- Sedimentary facies: Freshwater
- Lithofacies: Interbedded sandstone, siltstone and mudstone, Conglomerate, Pumice tuff
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Gifu pref.
- Tephra: MZ-1 (16.4 Ma, FT), Hosokute Lapilli Tuff Bed (17.7 Ma, FT), Hiyoshigawa Tuff Bed (16.6 Ma, FT), MZ-2 (18.2 Ma, FT)
- Sasao et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.2, pp.141-150 DOI
- Sasao et al. (2011) Jour. Geol. Soc. Japan, vol.117, no.8, pp.476-481 DOI