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On-NG Tephra Takemoto et al., 1987

Abbr.: On-NG

• Tephra
• late Pleistocene

• Lithofacies (Upper): Tephra
• Lithofacies: Pumice
• Distribution axis: Northeast

• Source: Ontake volcano
• Thickness: 5 - 90 cm

• Distribution: Lake Tsurugaike, Shimogo city, Minamiaizu county, Fukushima pref.; Shozawa creek, Nagawa, Matsumoto city, Nagano pref.

• Yamamoto (1999) Geology of the Tajima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 8p.)
• Nakano et al. (1995) Geology of the Norikuradake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 139p. (in Japanese with English abstract 4p.)