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Tzw Tephra Sawaguri and Kurokawa, 1986

Abbr.: Tzw

• Type locality: Jorakuji, Izumozaki city, Santo county, Niigata prefecture
• Tephra
• Pliocene - Pleistocene

• Lithofacies: Vitreous volcanic ash
• Sedimentary structures: Graded bedding

• Thickness: 9 cm
• Host: Nishiyama Formation

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

• 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.)