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Ab I Tephra Yasui et al., 1983

Abbr.: Ab I

• Type locality: Aburaden, Kariwa city, Kariwa county, Niigata prefecture
• Tephra
• middle Pleistocene
• Correlation: Og

• Lithofacies: Volcanic ash
• Sedimentary structures: Pipe rocks

• Host: Uonuma Formation, Funabashi Sand Formation
• Thickness: 13 - 125 cm

• Distribution: Aburaden, Kariwa city, Kariwa 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.)