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Chw Tephra Kurokawa et al., 1989

Abbr.: Chw

• Type locality: Chuei, Mishima, Nagaoka city, Niigata prefecture
• Tephra
• Pliocene - Pleistocene

• Lithofacies: Volcanic ash

• Host: Nishiyama Formation
• Thickness: 23 cm

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

• Distribution: Chuei, Mishima, Nagaoka city, Niigata pref.; Yoshikawa - Ogamaya - Jorakuji, Izumozaki city, Mito county, Niigata pref.; Ushirodani - Fujikake, Nishiyama town, Kashiwazaki city, Niigata pref.; Sochi pass, Kashiwazaki 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.)