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Ys Tephra Kobayashi and Abe, 1981

Abbr.: Ys

• Type locality: Shimoyoshimizu, Izumozaki city, Santo county, Niigata prefecture
• Tephra
• middle Pleistocene (0.79 Ma, FT)
• Correlation: Ab II

• Lithofacies (Upper): Volcanic ash
• Lithofacies (Middle): Sands
• Lithofacies (Lower): Vitreous volcanic ash

• Thickness (Upper): 43 cm
• Thickness (Middle): 7 cm
• Thickness (Lower): 10 cm
• Host: Uonuma Formation

• Distribution: Shimoyoshimizu, Izumozaki city, Santo county, Niigata pref.

• Kobayashi et al. (1993) Geology of the Izumozaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 91p. (in Japanese with English abstract 4p.)