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SK130 Tephra Niigata Plain Research Group, 1970

Abbr.: SK130

• Type locality: Hachioji, Oguni town, Nagaoka city, Niigata prefecture
• Tephra
• Pleistocene

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

• Thickness: ca. 8 - 14 m
• Host: Uonuma Formation

• Distribution: Hachioji, Oguni town, Nagaoka city, Niigata pref.; Kairo - Inubushi, Matsudai, 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. (1989) Geology of the Okanomachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 5p.)