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Sug b Tephra
Abbr.: Sug b
- Tephra
 
- Pliocene - Pleistocene
 
- Distribution: Niigata pref.
 
- Kobayashi et al. (1989) Geology of the Okanomachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 5p.)