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Ocg Tephra Kurokawa et al., 1987

Abbr.: Ocg

• Type locality: Ochimizu seashore, Nagaoka city, Niigata prefecture
• Tephra
• Pliocene - Pleistocene

• Lithofacies: Vitreous volcanic ash (3 - 5 units)

• Host: Nishiyama Formation
• Thickness (A unit): 10 - 100 cm
• Thickness (Overall): 100 - 200 cm

• Distribution: Ochimizu seashore, Nagaoka city, Niigata pref.; Otsu, Nishiyama town, Kashiwazaki city, Niigata pref.; Shiiya - Takahama elementary school, Kashiwazaki 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.)