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Wz Tephra Yanagisawa et al., 1986

Abbr.: Wz

• Type locality: Wanazu creek, Kawaguchi, Nagaoka city, Niigata prefecture
• Tephra
• Pleistocene (2.6 Ma, FT)

• Lithofacies: Rhyolite vitreous volcanic ash

• Host: Furuto Formation

• Distribution: Wanazu creek - Kizawa, Kawaguchi, 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.)