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O7 Tephra

Abbr.: O7

• Tephra
• Pleistocene
• Correlation: Ss-Pnk

• Lithofacies: Vitreous volcanic ash

• Host: Otadai Formation
• Thickness: ca. 31 - 70 cm or thicker

• Distribution: Tsunada, Ichinomiya city, Chosei county, Chiba pref.; Honoki, Futtsu city, Chiba pref.

• Utsunomiya and Ooi (2019) Geology of the Kazusa-Ohara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 127p. (in Japanese with English abstract 4p.)
• 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.)