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Ks Tephra Yanagisawa et al., 1986

Abbr.: Ks

• Type locality: Usagibatake, Hirokami, Uonuma city, Niigata prefecture
• Tephra
• Pleistocene

• Lithofacies: Volcanic ash
• Lithofacies (Minor): Sands, Lignite

• Host: Uonuma Formation
• Thickness: 50 - 110 cm

• Distribution: Usagibatake, Hirokami, Uonuma city, Niigata pref.; Imogawa river, Nagaoka 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.)