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To3 Tephra

Abbr.: To3

• Tephra
• Pliocene

• Sedimentary facies (Lower): Turbidite tuff
• Lithofacies (Upper): Tephra
• Lithofacies (Lower): Scoria tephra
• Sedimentary structures (Lower): Graded bedding, Reversed graded bedding

• Host: Tomiya Formation
• Thickness (Upper): 30 - 40 cm
• Thickness (Lower): 14 - 40 cm

• Distribution: Chiba pref.

• 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.)