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Ykp Tephra Kurokawa et al., 1989

Abbr.: Ykp

• Type locality: Jorakuji, Izumozaki city, Santo county, Niigata prefecture
• Tephra
• middle Miocene - early Pliocene (ca. 3.9 Ma)
• Correlation: Uykp, T1?

• Lithofacies: Pumiceous volcanic ash

• Host: Nishiyama Formation
• Thickness: 12 cm

• Distribution: Jorakuji - Yoshikawa, Izumozaki city, Santo county, Niigata pref.; Tazawa, Nishiyama town, Kashiwazaki city, Niigata pref.; Takiya, Kariwa city, Kariwa county, Niigata pref.

• 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.)