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Jp Tephra Kikuchi et al., 1984

Abbr.: Jp

• Type locality: Jorakuji, Izumozaki city, Santo county, Niigata prefecture
• Tephra
• middle Pleistocene (2.3 Ma, FT)

• Lithofacies: Pumiceous volcanic ash

• Thickness: 20 - 30 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.)