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Masudagawabashi Tuff Isogai, 2000

• Type locality: east of Masudagawa bridge, Kamimasuda, Matsuida town, Annaka city, Gunma prefecture
• Tephra
• Miocene
• Intruded by: Dacite sill

• Lithofacies: Tuff

• Host: Itahana Formation
• Thickness: 5 - 6 m or thicker

• Distribution: Masuda river - Miyakake - Aoki, Matsuida town, Annaka city, Gunma pref.; Morikuma, Nishikamiakima, 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.)