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Os Tuff

• Type locality: Osawa, Kashimadai, Osaki city Miyagi prefecture
• Tephra
• Miocene

• Lithofacies: Tuff

• Host: Kashimadai Formation

• Distribution: Osawa, Kashimadai, Osaki city Miyagi pref.

• Ishii et al. (1982) Geology of the Matsushima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 121p. (in Japanese with English abstract 9p.)