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Tazawa Tuff Hirooka et al., 1957MS

Formerly defined as the top member of Kitamata Formation.

• Type locality: Nakamine, Tazawa, Sakata city, Yamagata prefecture
• Volcanic rocks
• Miocene

• Lithofacies: Acidic pumiceous - sandy tuff

• Thickness: Some dozen m

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

• Distribution: Nakamine, Tazawa, Sakata city, Yamagata pref.

• Tsuchiya (1989) Geology of the Osawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 6p.)
• Ikebe et al. (1979) Geology of the Sakata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 42p. (in Japanese with English abstract 3p.)