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Osg Tephra Kudo et al., 2011

Synonym.: Osg

• Type locality: Osawa, Sanjo city, Niigata prefecture
• Tephra
• Pliocene (3.5 Ma or younger)

• Lithofacies: Tuff

• Host: Minagawa Formation
• Thickness: 120 cm

• Distribution: Osawa, Sanjo city, Niigata pref.; Shimojio, Nagaoka city, Niigata pref.

• Kudo et al. (2011) Geology of the Kamo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 162p. (in Japanese with English abstract 4p.)