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

Abbr.: Syp

• Type locality: Suyoshi river, Suyoshi town, Nagaoka city, Niigata prefecture
• Tephra
• Pliocene (4.22 4.16 Ma, FT; 2.28 Ma, K-Ar)

• Lithofacies: Pumice tuff

• Host: Kakuma Formation
• Thickness: 27 - 230 cm

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