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U3A Tephra
Abbr.: U3A
- Lithofacies: Vitreous volcanic ash
- Distribution: Iizawa, Mutsuzawa city, Chosei county, Chiba pref.
- Nanayama et al. (2016) Geology of the Mobara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)