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O₂ Tephra

Abbr.: O₂

Invalid synonym: Arayama 3 Tuff

• Tephra
• Miocene

• Lithofacies: Pumiceous tuff (1 - 4 units)
• Sedimentary structures: Cross stratification

• Thickness: ca. 10 - 20 m
• Host: Nishitoyama Sandstone Member, Hirabayashi Sandstone Member

• Distribution: Teramachi town - Nagasawa, Toyama city, Toyama pref.

• Sakamoto (1963) Toyama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 45p. (in Japanese with English abstract 6p.)
• 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.)