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Thp Tephra (Collaborative Research Group for Eastern Marginal Hills of Niigata Plain, 1990) Kobayashi et al., 1991

Abbr.: Thp

Invalid synonym: Ho-Hy

• Type locality: Tai river, Tai town, Mitsuke city, Niigata prefecture
• Tephra
• Pliocene

• Lithofacies: Volcanic ash (a few units)

• Host: Kakuma Formation, Minagawa Formation
• Thickness: ca. 10 - 60 cm

• Distribution: Tai river, Tai town, Mitsuke city, Niigata pref.; Miyaji town - Nirehara, Nagaoka city, Niigata pref.; Nagino - Shinbo, 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.)