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Ns Tephra Yanagisawa et al., 1986

Abbr.: Ns

• Type locality: Nishimata river, Horinouchi, Uonuma city, Niigata prefecture
• Tephra
• Pleistocene

• Lithofacies (Upper): Rhyolite vitreous volcanic ash
• Lithofacies (Lower): Dacite vitreous crystalline volcanic ash

• Host: Uonuma Formation
• Thickness (Upper): 1 m
• Thickness (Lower): 15 cm

• Distribution: Nishimata river, Horinouchi, Uonuma city, Niigata pref.; Tagawa river - Uonoji river, Uonuma city, Niigata pref.

• 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.)