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Tg Tephra Niigata Volcanic Ash Group, 1983

Abbr.: Tg

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

• Lithofacies: Dacite vitreous volcanic ash

• Host: Uonuma Formation
• Thickness: 16 - 30 cm

• Distribution: Tagawa river - Nakasato, Tokamachi city, Niigata pref.; Tsunan city, Nakauonuma county, 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.)
• Yanagisawa et al. (1985) Geology of the Tokamachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 104p. (in Japanese with English abstract 6p.)