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Irg Tephra Kazaoka, 1988

Abbr.: Irg

• Type locality: Iriyama creek, Nakasenda, Kawanishi, Tokamachi city, Niigata prefecture
• Tephra
• Pleistocene

• Lithofacies: Volcanic ash

• Thickness: 20 - 190 cm
• Host: Uonuma Formation

• Distribution: Iriyama creek, Nakasenda, Kawanishi, Tokamachi city, Niigata pref.; Ebi, Matsudai, Tokamachi city, Niigata pref.

• Kobayashi et al. (1989) Geology of the Okanomachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 5p.)