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Akeyo Formation
- Type locality: Gifu prefecture
- Coherent formation
- First Seto Inland Sea
- Sedimentary basin in island arc
- Miocene (ca. 18 Ma; 17 - 16 Ma, FT)
- Contemporaneous heterotopic facies: Hongo Formation
- Sedimentary facies: Marine
- Lithofacies: Tuffaceous sandstone, Tuffaceous mudstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Gifu pref.
- Fossils: Mangroves (Pollen)
- Tephra: Kurosuji, Tu, Ak-13 (15.9 Ma, FT), Ak-12 (16.0, 15.5 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
- Yamanoi et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.5, pp.262-266 DOI