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Yukawa Welded Tuff

• Tephra
• Pleistocene

• Lithofacies: Hornblende biotite augite hypersthene dacite welded tuff (many flow units)

• Thickness: ca. 15 m

• Distribution: Ushikubi river - Yukawa river, Minamimaki city, Minamisaku county, Nagano pref.; Inago, Komi city, Minamisaku county, Nagano pref.

• Kawachi (1974) Geology of the Tateshinayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 5p.)