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Otanigawa Tuff Muramatsu, 1989

• Tephra
• early Pleistocene (1.76?, 1.03 Ma, FT)

• Lithofacies: Pumiceous lapilli tuff
• Lithofacies (Minor): Tuffaceous sandstone

• Thickness: 6 m or thicker
• Host: Kajiyashiki Formation

• Distribution: Otanigawa river, Itoigawa city, Niigata pref.

• Nagamori et al. (2018) Geology of the Itoigawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 75p. (in Japanese with English abstract 3p.)