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Suga Tuff

• Tephra
• early Pliocene (3.3 Ma, FT)

• Lithofacies: Acidic tuff
• Sedimentary structures (Upper): Parallel stratification
• Sedimentary structures (Lower): Wavy stratification

• Host: Tamugigawa Formation
• Thickness: 2 m

• Distribution: Iida river, Suga, Maki ward, Joetsu city, Niigata pref.

• Takeuchi and Kato (1994) Geology of the Takada-tobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 67p. (in Japanese with English abstract 5p.)