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An21 Tephra

Abbr.: An21

• Tephra
• Pliocene

• Lithofacies: Tephra

• Host: Anno 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.)