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O2 Tephra

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

• Lithofacies (Top): Fine tuff
• Lithofacies (Upper): Coarse tuff
• Lithofacies (Middle): Pumice tuff
• Lithofacies (Lower): Sandy tuff
• Lithofacies (Bottom): Sandy pumice tuff

• Thickness: ca. 15 - 20 m
• Thickness (Upper): 2 - 3 m
• Thickness (Middle): 5 - 8 m
• Thickness (Lower): 4 - 6 m
• Thickness (Bottom): 2 - 6 m
• Host: Omatsuzawa Formation

• Distribution: Yamaya, 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.)