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Nashikizawa Tuff Member Muraoka and Hase, 1990
- Type locality: Nashiki creek, Kuroishi city, Aomori prefecture
- Type locality (Dacite): Senjo creek, Towada city, Aomori prefecture
- Tephra
- Miocene
- Intruded by: Aseishigawa Basalt, Arakawa Dolerite
- Sedimentary facies: Marine
- Sedimentary facies: Submarine pyroclastic flow deposit
- Lithofacies: Pumice tuff (3 sheets or more, Perlite-deficient)
- Lithofacies (Minor): Lapilli tuff, Tuff, Siltstone, Shale, Dacite lava
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Nashiki creek - Ochiai hot spring, Kuroishi city, Aomori pref.; Takinosawa creek - Nishimata creek, Kuroishi city, Aomori pref.; Mount Otate - Shukugawara - Ushizawa, Hirosaki city, Aomori pref.; Mount Obiraki, Owani city, Minamitsugaru county, Aomori pref.; Jogakura valley, Aomori city, Aomori pref.; Mount Kuromori, Aomori city - Towada city, Aomori pref.; Ose river, Towada city, Aomori pref.; Mount Ishikura, Aomori city, Aomori pref.; Senjo creek, Towada city, Aomori pref.
- Kudo (2005) Geology of the Towada District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 3p.)
- Takarada and Muraoka (2004) Geology of the Hakkoda San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 86p. (in Japanese with English abstract 4p.)
- Muraoka and Hase (1990) Geology of the Kuroishi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 124p. (in Japanese with English abstract 8p.)