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Ot Tephra Yasui et al., 1983

Abbr.: Ot

• Type locality: Otadani river, Koshiji, Nagaoka city, Niigata prefecture
• Tephra
• early Pleistocene

• Lithofacies: Silty volcanic ash

• Host: Haizume Formation
• Thickness: 3 m

• Distribution: Otadani river, Koshiji - Mishimadani, Nagaoka city, Niigata pref.

• 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.)