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Nis Tephra
Abbr.: Nis
- Lithofacies: Tuff breccia
- Distribution: Nishitarusawa forest road - Shikumi river, Sakae city, Shimominochi county, Nagano pref.
- Shimazu and Tateishi (1993) Geology of the Naebasan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 90p. (in Japanese with English abstract 5p.)