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Ka Tephra Yanagisawa et al., 1985

Abbr.: Ka

• Type locality: Kainogawa, Tokamachi city, Niigata prefecture
• Tephra
• Pleistocene
• Correlation: Gjd40

• Lithofacies: Rhyolite
• Lithofacies (Upper): Volcanic ash
• Lithofacies (Middle): Vitreous volcanic ash
• Lithofacies (Lower): Volcanic ash
• Sedimentary structures (Upper, Minor): Cross stratification

• Host: Uonuma Formation
• Thickness: 1 - 2.3 m

• Distribution: Kainogawa - Kawaji river - Tarusawa river, Tokamachi city, Niigata pref.; Tsujimata 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.)
• Yanagisawa et al. (1985) Geology of the Tokamachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 104p. (in Japanese with English abstract 6p.)