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U9 Tephra

Abbr.: U9

• Tephra
• Pleistocene

• Lithofacies (Upper): Vitreous tephra, Pumice
• Lithofacies (Lower): Scoria

• Host: Umegase Formation
• Thickness (Upper): 14 - 45 cm
• Thickness (Lower): 3 cm

• Distribution: Yahata, Ichinomiya city, Chosei county, Chiba pref.; Naewari, Futtsu city, 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.)
• Nakajima and Watanabe (2005) Geology of the Futtsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 102p. (in Japanese with English abstract 8p.)