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Se Tephra

Abbr.: Se

• Type locality: Sennosawa, Kawaguchi, Nagaoka city, Niigata prefecture
• Tephra
• Pleistocene
• Correlation: OM1-OK III

• Lithofacies: Rhyolite vitreous volcanic ash (5 units)

• Host: Uonuma Formation
• Thickness (A unit): ca. 0.1 - 0.7 m

• Distribution: Sennosawa - Wanazu - Aikawa river, Kawaguchi, Nagaoka 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.)