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OK-2 Tephra

Abbr.: OK-2

• Type locality: Niigata prefecture
• Tephra
• Pliocene - Pleistocene (4.0 Ma, FT)

• Lithofacies: Volcanic ash

• Host: Minagawa Formation, Kawaguchi Formation
• Thickness: 8 - 15 cm

• Distribution: Fukuyamashinden, Uonuma 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.)