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Am78 Tephra

Abbr.: Am78

• Tephra
• Miocene (5.7 Ma, FT)
• Correlation: OK

• Lithofacies: Tuff, Pumice tuff (6 fall units)
• Sedimentary structures (Tuff): Graded bedding
• Sedimentary structures (Pumice tuff): Reversed graded bedding

• Host: Amatsu Formation

• 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.)
• Nakajima et al. (1981) Geology of the Kamogawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 107p. (in Japanese with English abstract 7p.)