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Jsp Tephra Kobayashi et al., 1993

Abbr.: Jsp

• Type locality: Jorakuji, Izumozaki city, Santo county, Niigata prefecture
• Tephra
• middle Miocene - early Pliocene

• Lithofacies (Upper): Sandy volcanic ash, Vitreous volcanic ash
• Lithofacies (Lower): Sandy volcanic ash

• Thickness (Upper): 10 cm
• Thickness (Lower): ca. 120 cm
• Host: Shiiya 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.)