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SK030 Tephra Niigata Plain Collaborative Research Group, 1970

Abbr.: SK030

Invalid synonym: Zr, Sz, Ohirota Tuffaceous Mudstone, Tsukanoyama Tuffaceous Mudstone

• Type locality: Shibanomata river, Saruhashi, Oguni town, Nagaoka city, Niigata prefecture
• Tephra
• early Pleistocene (2.3, 1.3, 1.22 Ma, FT)
• Correlation: JA-O18L

• Lithofacies (Top): Andesite scoriaceous volcanic ash
• Lithofacies (Upper): Andesite scoriaceous volcanic ash
• Lithofacies (Middle): Rhyolite cordierite-bearing pumiceous volcanic ash
• Lithofacies (Lower): Andesite scoriaceous lapilli
• Lithofacies (Bottom): Silt

• Thickness: 0.3 - 30 m
• Thickness (Top): ca. 1 - 5 m
• Thickness (Upper): 1 - 3 m
• Thickness (Middle): 0.2 - 5.7 m
• Host: Haizume Formation, Uonuma Formation, Maeko Member, Sori Member

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Shibanomata river - Tsuchiguchi river - Kirisawa river, Oguni town, Nagaoka city, Niigata pref.; Jorakuji - Aida - Chuei - Ogamaya - Inagawa - Jiganji, Izumozaki city, Santo county, Niigata pref.; Sakatani - Torigoe - Asoda river, Nagaoka city, Niigata pref.; Nakasenda - Shinmachishinden - Tsuboyama - Kainogawa - Tarusawa, Tokamachi city, Niigata pref.; Tagawa river, Uonuma city, Niigata pref.; Mount Yamamoto, Ojiya city, Niiagata pref.; Yokotaira? river - Eboshi, Tsunan city, Nakauonuma county, Niigata pref.; Niteno, Sakae city, Shimominochi county, Nagano pref.
• Fossils: Pipe rocks

• 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. (1993) Geology of the Izumozaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 91p. (in Japanese with English abstract 4p.)
• Shimazu and Tateishi (1993) Geology of the Naebasan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 90p. (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.)