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Hachirogata Formation Shiraishi, 1990

• Type locality: Hachirogata, Akita prefecture
• Coherent formation
• Holocene (12,240 - 0.0 yBP, ¹⁴C)

• Sedimentary facies: Marine, Brackish
• Sedimentary facies: Inner bay
• Sedimentary facies: Tidal delta, Delta, Tidal flat
• Lithofacies: Mud

• Thickness: 62 m
• Lower limit: Unconformity (Tenno Formation)

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

• Distribution: Hachirogata, Akita pref.
• Fossils: Ostrea sp., Macoma sp., Raeta sp., Cobicula sp., Meropesta capillacea, Tegillarca sp.

• Shiraishi et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.33-50 DOI
• Fujimoto et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.51-74 DOI