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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
• Correlation: Kubohara Sandstone Facies, Shinano Formation, Ryusenji 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

• 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