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OT10 Nagamori, 1998

Abbr.: OT10

Synonym: Ogikubo Tuff

• Type locality: Arakurayama camp field, Kinasa, Nagano city, Nagano prefecture
• Tephra
• Miocene (3.6 Ma, FT)

• Lithofacies: Pumiceous volcanic ash

• Host: Ogikubo Formation, Takafu Formation
• Thickness: 40 cm - 4.5 m

• Distribution: Arakurayama camp field, Kinasa, Nagano city, 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.)