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Mo Tephra Yanagisawa et al., 1986

Abbr.: Mo

• Type locality: Uonoji river, Horinouchi, Uonuma city, Niigata prefecture
• Tephra
• Pleistocene

• Lithofacies: Dacite crystalline - vitreous volcanic ash
• Lithofacies (Minor): Charcoal

• Host: Uonuma Formation
• Thickness: 1 - 4 m

• Distribution: Uonoji river, Horinouchi, Uonuma city, Niigata pref.; Tagawa river, 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.)