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O₁ Tephra

Abbr.: O₁

Invalid synonym: Shogonji Tuff

• Tephra
• Miocene

• Lithofacies: Bentonitic tuff
• Lithofacies (Minor): Pumiceous sandstone

• Thickness: ca. 1 m
• Host: Aoidani Mudstone Member

• Distribution: Shogonji spring, Tonami city, Toyama pref.

• Sakamoto and Nozawa (1960) Yatsuo, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 8p.)