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Nyunai Formation Kato et al., 1958

Invalid synonym: Mizusawa Formation

• Type locality: Nyunai, Aomori city, Aomori prefecture
• Coherent formation
• middle - late Miocene (Dinoflagellates)

• Lithofacies (Upper): Basaltic volcanic breccia Lapilli stone
• Lithofacies (Lower): Mudstone, Sandstone
• Lithofacies (Lower, Minor): Basaltic volcanic breccia, Tuff breccia

• Thickness: 850 m or thicker
• Upper limit: Conformity (Genpachimori Formation), Unconformity (Obirakiyama Pyroclastic Flow Deposit, Isodayama Formation)
• Lower limit: Unknown

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

• Distribution: Namioka river, Magonai river, Takigawa, Aomori city, Aomori pref.
• Fossils: Dinoflagellates

• Nagamori et al. (2013) Geology of the Aomori-Seibu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 67p. (in Japanese with English abstract 4p.)