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Nigorigawa Tuff Member Nagamori et al., 2010

• Type locality: 700 m above sea level, Nigorigawa river, Mitaki, Itoigawa city, Niigata prefecture
• Coherent formation
• early Pliocene (5.2 Ma, FT)

• Lithofacies (Upper): Tuff, Pumice tuff
• Lithofacies (Upper, Minor): Vitreous siltstone
• Lithofacies (Lower): Lapilli tuff, Pumice tuff
• Sedimentary structures (Upper): Parallel stratification, Trough cross-stratification

• Thickness: 20 m or thicker

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

• Distribution: Nigorigawa river - Fudogawa river - Kajiyamashinyu hot spring, Mitaki, Itoigawa city, Niigata pref.

• Nagamori et al. (2010) Geology of the Kotaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 130p. (in Japanese with English abstract 4p.)
• Takeuchi et al. (2010) Jour. Geol. Soc. Japan, vol.116, Supplement, pp.123-142 DOI