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Jsg Tephra Kurokawa and Sawaguri, 1990

Abbr.: Jsg

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

• Lithofacies: Vitreous volcanic ash

• Host: Nishiyama Formation
• Thickness: 3 - 5 cm

• Distribution: Jorakuji - Tanaka, Izumozaki city, Santo county, Niigata pref.; Tazawa, Nishiyama town, Kashiwazaki city, Niigata pref.
• Fossils: Pipe rocks

• Kobayashi et al. (1995) Geology of the Kashiwazaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 102p. (in Japanese with English abstract 4p.)
• 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.)