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NA33 Tephra Tokuhashi, 1985

Abbr.: NA33

• Type locality: Nobe river - Asahi river, Ojiya city, Niigata prefecture
• Tephra
• Pliocene

• Lithofacies: Andesite lapilli tuff (5 - 6 units)
• Lithofacies (NA33F): Andesite lapilli lithic tuff
• Lithofacies (NA33E): Andesite lithic tuff
• Lithofacies (NA33D): Andesite lithic tuff
• Lithofacies (NA33C): Andesite lithic tuff
• Lithofacies (NA33B): Andesite lithic tuff
• Lithofacies (NA33A): Andesite lithic tuff

• Host: Kawaguchi Formation, Kakuma Formation, Minagawa Formation

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

• Distribution: Nobe river - Asahi river - Mount Kanagura, Ojiya city, Niigata pref.; Hoshigatoge pass - Odo pass - Mount Shiroyama, Nagaoka city, Niigata pref.; Imogawa river - Takinomata, Uonuma city, Niigata pref.

• Kobayashi et al. (1991) Geology of the Nagaoka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 132p. (in Japanese with English abstract 6p.)
• Yanagisawa et al. (1986) Geology of the Ojiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 177p. (in Japanese with English abstract 6p.)