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Gjd40 Tephra Kurokawa et al., 2000

Synonym.: Gjd40

Invalid synonym: Cdn50

• Type locality: Gejogawa dam, Kamo city, Niigata prefecture
• Tephra
• Pliocene (ca. 1.55 Ma)
• Correlation: HK40 (Niitsu hills), Nsp (Nishiyama Formation), Ka

• Lithofacies: Tuff
• Sedimentary structures (Lower): Parallel stratification

• Host: Minagawa Formation
• Thickness (Upper): 4 - 6 cm
• Thickness (Middle): 2 - 6 cm
• Thickness (Lower): 12 - 14 cm

• Distribution: Gejogawa dam, Kamo city, Niigata pref.

• Kudo et al. (2011) Geology of the Kamo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 162p. (in Japanese with English abstract 4p.)