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Nis Tephra

Abbr.: Nis

• Tephra
• Pleistocene

• Lithofacies: Tuff breccia

• Host: Niteno Member
• Thickness: ca. 20 cm
• Lower limit: Unconformity (Higashinosawa Formation)

• 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.)