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Tzc Tephra Kazaoka, 1986

Abbr.: Tzc

• Type locality: Tsujimata river, Horinouchi, Uonuma city, Niigata prefecture
• Tephra
• Pleistocene
• Correlation: Kk Tephra

• Lithofacies (Upper): Vitreous volcanic ash
• Lithofacies (Middle): Brown volcanic ash
• Lithofacies (Lower): White volcanic ash
• Sedimentary structures (Lower): Cross stratification

• Thickness: 80 - 200 cm
• Thickness (Upper): 40 - 150 cm
• Thickness (Middle): 10 - 30 cm
• Thickness (Lower): 30 - 60 cm
• Host: Uonuma Formation

• Distribution: Tsujimata river, Horinouchi, Uonuma city, Niigata pref.

• Kobayashi et al. (1989) Geology of the Okanomachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 5p.)
• 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.)