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To12 Tephra

Abbr.: To12

• Tephra
• Pliocene

• Lithofacies (Upper): Pumice tuff
• Lithofacies (Middle): Scoria tuff
• Lithofacies (Lower): Tuff, Pumice tuff
• Sedimentary structures (Lower): Reversed graded bedding

• Host: Tomiya Formation
• Thickness (Upper): 2 - 8 cm
• Thickness (Middle): 2 - 6 cm
• Thickness (Lower): 9 - 23 cm

• Distribution: 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.)
• 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.)