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Ftg Tephra
Abbr.: Ftg
- Type locality: Niigata prefecture
- Tephra
- Pliocene
- Distribution: Niigata pref.
- Kobayashi et al. (2002) Geology of the Sanjo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 98p. (in Japanese with English abstract 4p.)