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O1 Tephra
Abbr.: O1
Invalid synonym: Shogonji Tuff
- Lithofacies: Bentonitic tuff
- Lithofacies (Minor): Pumiceous sandstone
- 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.)