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RW Tephra

Abbr.: RW

• Type locality: Tagawa, Tokamachi city, Niigata prefecture
• Tephra
• Pleistocene

• Lithofacies: Pumiceous volcanic ash
• Lithofacies (Minor): Lignite, Lignite-bearing silt

• Host: Uonuma Formation
• Thickness: ca. 20 cm

• Distribution: Tagawa, Tokamachi 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.)