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Mgp Tephra Niigata Volcanic Ash Research Group, 1983

Abbr.: Mgp

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

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

• Thickness: 1 - 2 m
• Host: Uonuma Formation

• Distribution: Kijima river, Kawanishi, Tokamachi city, Niiagata 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.)