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LA Tephra Uonuma Hills Collaborative Research Group, 1978

Abbr.: LA

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

• Sedimentary facies: Mudflow deposit
• Lithofacies: Volcanic ash, Gravels

• Host: Uonuma Formation
• Thickness: 0.5 - 3 m

• Distribution: Tagawa river - Shimooita river - Hanekawa river, Tokamachi city, Niigata pref.

• 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.)