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Gabasawa Tuff Member

• Type locality: Gabasawa, Kaneyama city, Mogami county, Yamagata prefecture
• Voclanic rocks
• middle Miocene

• Lithofacies: Acidic pumiceous tuff
• Lithofacies (Top): Dacite tuff

• Thickness: 400 m or thicker
• Upper limit: Conformity (Iritamo Rhyolites)
• Lower limit: Bottom of tuff-dominant bed
• Lower limit: Transitional (Shunezaka Sandstone and Conglomerate Member)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Gabasawa - Iritamozawa - Masuzawa creek - Nakada river, Kaneyama city, Mogami county, Yamagata pref.

• Ozawa and Sumi (1961) Uzenkaneyama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 66p. (in Japanese with English abstract 5p.)