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Bihoku Group

• Type locality: Miyoshi city - Shobara city, Hiroshima prefecture
• Coherent formation
• Miocene
• Correlation: Nichiôji Formation, Ukan Formation

• Sedimentary facies: Marine

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Miyoshi city - Shobara city, Okayama pref.; Niimi city, Hiroshima pref.
• Fossils: Bivalves (Geloina sp.), Pollen (Bruguiera sp.)

• Goto et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.4, pp.321-333 DOI
• Yamanoi et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.5, pp.262-266 DOI