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Omine-SK110 Tephra (Niigata Plain Collaborative Research Group, 1970) Nagahashi et al., 2000

Abbr.: Om-SK110

Synonym.: SK110, Gjd10, Ng Tuff

• Type locality: Shibanomata river, Oguni town, Nagaoka city, Niigata prefecture
• Tephra
• Pleistocene (1.65 - 1.61 Ma)
• Correlation: Sg2 (Yokohama, Kanagawa), Kd25, Ob4a (Choshi, Chiba), O3 (Kanazawa, Ishikawa), Km3, Omine Pyroclastic Flow Deposit, Kamihijikata I, Km3 (Oga, Akita)

• Sedimentary facies: Submarine gravity flow deposit
• Lithofacies (Upper): Rhyolite volcanic ash silt
• Lithofacies (Middle): Rhyolite vVolcanic ash
• Lithofacies (Lower): Rhyolite muddy volcanic ash
• Sedimentary structures (Middle): Parallel stratification
• Sedimentary structures (Lower): Cross stratification

• Source: Jiigatake-Shirasawatengu Caldera Complex
• Thickness: ca. 0.7 - 2 m
• Host: Uonuma Formation, Furuto Formation, Kakuma Formation, Minagawa Formation, Kiwada Formation, Nishiyama Formation, Haizume Formation, Koikegawa Member

• Distribution: Shibanomata river - Kunisawa river, Oguni town, Nagaoka city, Niigata pref.; Chofukuji, Kamo city, Niigata pref.; Furuto, Sanjo city, Niigata pref.; Murojima, Tokamachi city, Niigata pref.; Kogurosu - Ishikawa, Kashiwazaki city, Niigata pref.; Okanomachi - Tsubono, Takayanagi town, Kashiwazaki city, Niigata pref.; Shiono, Tokamachi city, Niigata pref.; Boso peninsula, Chiba pref.

• Utsunomiya and Ooi (2019) Geology of the Kazusa-Ohara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 127p. (in Japanese with English abstract 4p.)
• Tamura et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.1, pp.23-39 DOI
• Kudo et al. (2011) Geology of the Kamo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 162p. (in Japanese with English abstract 4p.)
• Kobayashi et al. (2002) Geology of the Sanjo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 98p. (in Japanese with English abstract 4p.)
• 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. (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.)
• 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.)