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Koso Tuff

Invalid synonym: Sasakyu Tuff

It had been treated as a member of Ogawa Formation.

• Tephra
• Miocene (6.1 Ma, K-Ar)
• Correlation: Susobana Formation

• Lithofacies:

• Distribution: Koso, Omi city, Higashichikuma county, Nagano pref.

• Nagamori et al. (2003) Geology of the Togakushi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 109p. (in Japanese with English abstract 3p.)