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Kog Tephra Kazaoka, 1988

Abbr.: Kog

• Type locality: Akatani, Kawanishi, Tokamachi city, Niiagata prefecture
• Tephra
• Pleistocene

• Lithofacies: Vitreous volcanic ash
• Sedimentary structures: Parallel stratification

• Thickness: 50 - 250 cm
• Host: Uonuma Formation

• Distribution: Akatani - Koshigasawa, Tokamachi city, Niiagata pref.; Shibanomata river, Oguni town, Nagaoka 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.)