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

Abbr.: Kwp

• Type locality: Kaki river, Kaki town, Nagaoka city, Niigata prefecture
• Tephra
• Pliocene (3.33 Ma, FT)

• Lithofacies:

• Host: Kakuma Formation
• Thickness (Upper): ca. 100 cm
• Thickness (Lower): 20 - 70 cm

• Distribution: Kaki river, Kaki town, Nagaoka city, Niigata pref.; Otoyoshi river - Saruhashi river - Nanban forest road, 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.)