[ Top ] [ Japanese ]

NA42 Tephra Tokuhashi, 1985

Abbr.: NA42

• Type locality: Nobe river, Ojiya city, Niigata prefecture
• Tephra
• Pliocene

• Lithofacies: Andesite lithic lapilli tuff

• Host: Kawaguchi Formation, Minagawa Formation
• Thickness: 11 - 13 cm

• Distribution: Nobe river - Asahi river - Shinano river, Ojiya city, Niigata pref.; Mount Kanagura - Daido pass - Mount Shiroyama - Mount Dango, Nagaoka city, Niigata pref.; Mount Sanbonbuna - Imogawa river - Takinomata, Uonuma city, Niigata pref.

• Kobayashi et al. (1991) Geology of the Nagaoka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 132p. (in Japanese with English abstract 6p.)
• Yanagisawa et al. (1986) Geology of the Ojiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 177p. (in Japanese with English abstract 6p.)