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U3A Tephra

Abbr.: U3A

• Tephra
• Pleistocene

• Lithofacies: Vitreous volcanic ash

• Host: Umegase Formation
• Thickness:

• 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.)