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Ctg Tephra (Niigata Plain Collaborative Research Group, 1970) Kobayashi et al., 1991

Abbr.: Ctg

• Type locality: Chinta river, Tsubakizawa, Mitsuke city, Niigata prefecture
• Tephra
• Pliocene (4.58 Ma, FT)

• Lithofacies: Tuff
• Lithofacies (Bottom): Pumiceous tuff

• Host: Kakuma Formation
• Thickness: 300 - 700 cm

• Distribution: Chinta river - Tai river - Koide river, Tsubakizawa, Mitsuke city, Niigata pref.; Hokake river - Kawatani 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.)