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Ko Tephra

Abbr.: Ko

• Type locality: Kowakita creek, Kawaguchi, Nagaoka city, Niigata prefecture
• Tephra
• Pleistocene

• Lithofacies: Rhyolite vitreous volcanic ash
• Sedimentary structures: Cross stratification

• Host: Furuto Formation
• Thickness: ca. 2 - 6 m

• Distribution: Kowakita creek, Kawaguchi, Nagaoka city, Niigata pref.; Aikawa river - Imogawa river, Nagaoka city, Niigata pref.; Ryuko, 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.)