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Am94 Tephra
Abbr.: Am94
- Tephra
- Miocene (5.2 Ma, FT)
- 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.)