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Ot1 Tephra

Abbr.: Ot1

• Type locality: Hikotarobatake, Tsubata city, Kahoku county, Ishikawa prefecture
• Tephra
• middle Miocene (12.4 Ma, U-Pb; 12.6 Ma, FT)

• Lithofacies: Volcanic ash
• Lithofacies (Minor): Tuffaceous sandstone, Tuffaceous mudstone

• Thickness: 3.5 - 10 m
• Host: Otogawa Formation

• Distribution: Hikotarobatake, Tsubata city, Kahoku county, Ishikawa pref.; Wada river, Toyama city, Toyama pref.;

• Nakajima et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.7, pp.483-516 DOI
• Sumi et al. (1989) Geology of the Isurugi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 118p. (in Japanese with English abstract 5p.)