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Htp Tephra Kobayashi et al., 1991

Abbr.: Htp

• Type locality: Hontsugawa, Nagaoka city, Niigata prefecture
• Tephra
• Pliocene

• Lithofacies: Tuffaceous sandstone, Tuff, Sandstone, Sandy tuff

• Host: Kakuma Formation
• Thickness: 15 m or thicker

• Distribution: Hontsugawa - Hanzogane - Nishitani river, Nagaoka 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.)