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OK-5 Tephra

Abbr.: OK-5

• Type locality: Niigata prefecture
• Tephra
• Pliocene - Pleistocene

• Lithofacies: Vitreous tuff

• Host: Minagawa Formation
• Thickness: ca. 2 m

• Distribution: Omatsu creek - Kumatori creek, Fukuyama river, 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.)