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Ttp Tephra

Abbr.: Ttp

• Type locality: Kawatani river, Nagaoka city, Niigata prefecture
• Tephra
• Pliocene

• Lithofacies: Pumice tuff (2 units)

• Host: Kakuma Formation

• Distribution: Kawatani river, Nagaoka city, Niigata pref.; Koide river, Tochikubo, Mitsuke 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.)