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U6D Tephra

Abbr.: U6D

• Tephra
• Pleistocene

• Lithofacies: Vitreous volcanic ash

• Thickness: ca. 20 m
• Host: Umegase Formation, Koshiba Formation

• Distribution: Ichinono, Misaki town, Isumi city, Chiba pref.; Seagezawa creek, Isogo ward, Yokohama city, Kanagawa 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.)
• Mitsunashi and Kikuchi (1982) Geology of the Yokohama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 105p. (in Japanese with English abstract 4p.)