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Omig Tephra Kurokawa et al., 2002

Synonym.: Omig

• Type locality: Ominagawa river, Jojo, Kamo city, Niigata prefecture
• Tephra
• Pliocene (1.57 Ma, FT; 1.25 Ma, Calcareous nannofossils)
• Correlation: Sr-Asn-Kd8

• Lithofacies (Upper): Volcanic ash
• Lithofacies (Lower): Pumiceous volcanic ash
• Lithofacies (Lower, Minor): Pumiceous lapilli
• Sedimentary structures (Upper): Cross stratification, Slump structures

• Source: Aizu region, Fukushima pref.
• Host: Minagawa Formation
• Thickness: 2 m
• Thickness (Upper): 1.7 m
• Thickness (Lower): 30 cm

• Distribution: Jojo - Wakamiya - Chofukuji, Kamo city, Niigata pref.

• Kudo et al. (2011) Geology of the Kamo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 162p. (in Japanese with English abstract 4p.)