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SK120 Tephra Niigata Plain Collaborative Research Group, 1970

Abbr.: SK120

• Type locality: Shibanomata river, Saruhashi, Oguni town, Nagaoka city, Niigata prefecture
• Tephra
• Pleistocene

• Lithofacies (Upper): Pumiceous volcanic ash
• Lithofacies (Lower): Silty volcanic ash

• Host: Uonuma Formation
• Thickness (Upper): 5 - 120 cm
• Thickness (Lower): 5 - 200 cm

• Distribution: Shibanomata river, Saruhashi, Oguni town, Nagaoka city, Niigata pref.; Murojima, Tokamachi city, 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. (1989) Geology of the Okanomachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 5p.)