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

Abbr.: Usg

• Type locality: Urase river, Urase town, Nagaoka city, Niigata prefecture
• Tephra
• Pliocene - Pleistocene

• Lithofacies: Vitreous volcanic ash (4 - 5 units)

• Host: Minagawa Formation
• Thickness: 3 - 10 cm (A unit)

• Distribution: Urase river, Urase town, Nagaoka city, Niigata pref.; Asoda river, Nagaoka city, Niigata pref.; Hokake river, Katsura town, Nagaoka city, Niiagata 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.)