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Drg Tephra
Abbr.: Drg
- Tephra
- Pliocene - Pleistocene
- Lithofacies: Volcanic ash
- Distribution: Niigata pref.
- Yanagisawa et al. (2000) Geology of the Iiyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 144p. (in Japanese with English abstract 6p.)