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Kk Tephra Yanagisawa et al., 1985

Abbr.: Kk

• Type locality: Kasho creek, Tokamachi city, Niigata prefecture
• Tephra
• Pleistocene
• Correlation: Tzc Tephra

• Lithofacies: Rhyolite vitreous volcanic ash (2 units)
• Sedimentary structures (Upper): Cross stratification

• Host: Uonuma Formation
• Thickness: 1.8 - 2.5 m

• Distribution: Kasho creek - Tobitari river - Kainokawa river - Shimooita river, Tokamachi 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.)