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Sig Tephra Kurokawa et al., 1989

Abbr.: Sig

• Type locality: Jorakuji, Izumozaki city, Santo county, Niigata prefecture
• Tephra
• Pliocene - Pleistocene
• Correlation: Kd44-Nk, Tmg-R4

• Lithofacies: Vitreous volcanic ash

• Thickness: 7 - 10 cm
• Host: Nishiyama Formation

• Distribution: Jorakuji, Izumozaki city, Santo county, Niigata pref.
• Fossils: Pipe rocks

• Kobayashi et al. (1993) Geology of the Izumozaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 91p. (in Japanese with English abstract 4p.)