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

Abbr.: Oyl

• Type locality: Otoyoshi river, Otoyoshi town, Nagaoka city, Niigata prefecture
• Tephra
• Pliocene

• Lithofacies: Lapilli-bearing pumiceous volcanic ash
• Lithofacies (Minor): Silt

• Host: Kakuma Formation
• Thickness: 150 - 200 cm

• Distribution: Otoyoshi river, Otoyoshi town - Asoda river, 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.)