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Yamaguchi Tuff Geshi and Takeuchi, 2012

• Type locality: Akima river, Yamaguchi, Nishikamiakima, Annaka city, Gunma prefecture
• Tephra
• Miocene

• Lithofacies: Tuff
• Lithofacies (Minor): Accretionary lapilli

• Host: Itahana Formation
• Thickness: 3 - 8 m or thicker

• Distribution: Akima river, Yamaguchi, Nishikamiakima, Annaka city, Gunma pref.; Kamimasuda, Masudagawa, Annaka city, Gunma pref.

• Geshi and Takeuchi (2012) Geology of the Haruna San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 3p.)