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SK020 Tephra The Niigata Plain Collaborative Research Group, 1970
Abbr.: SK020
Invalid synonym: Pk
- Type locality: Shibanomata river, Saruhashi, Oguni town, Nagaoka city, Niigata prefecture
- Tephra
- middle Pleistocene (0.8 Ma, FT)
- Correlation: Sr-Kc-U8
- Lithofacies (Upper): Rhyolite vitreous volcanic ash (Pisolite part)
- Lithofacies (Middle): Dacite vitreous crystalline volcanic ash (Gomashio part)
- Lithofacies (Lower): Rhyolite vitreous volcanic ash (Pink part)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Shibanomata river - Sawada river, Saruhashi, Oguni town, Nagaoka city, Niigata pref.; Kirisawa river - Mioke, Oguni town, Nagaoka city, Niigata pref.; Kumoide town - Asoda river, Nagaoka city, Niigata pref.; Higashitani, Koshiji, Nagaoka city, Niigata pref.
- 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.)
- 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.)
- 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.)