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SK050 Tephra Niigata Plain Collaborative Research Group, 1970

Abbr.: SK050

Invalid synonym: Ng

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

• Lithofacies (Upper): Volcanic ash
• Lithofacies (Middle): Dacite crystalline volcanic ash
• Lithofacies (Lower): Interbedded pumice and tuffaceous sands
• Sedimentary structures: Trough cross-stratification

• Host: Uonuma Formation, Tt-TB
• Thickness: ca. 1 - 5.3 m

• Distribution: Shibanomata river, Saruhashi, Oguni town, Nagaoka city, Niigata pref.; Higashitani, Koshiji, Nagaoka city, Niigata pref.; Murojima - Tagawa river - Masuzawa river, Tokamachi city, Niigata pref.

• Takeuchi et al. (2000) Geology of the Matsunoyama Onsen District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 76p. (in Japanese with English abstract 5p.)
• Kobayashi et al. (1991) Geology of the Nagaoka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 132p. (in Japanese with English abstract 6p.)
• 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.)
• Yanagisawa et al. (1986) Geology of the Ojiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 177p. (in Japanese with English abstract 6p.)
• Yanagisawa et al. (1985) Geology of the Tokamachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 104p. (in Japanese with English abstract 6p.)