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Yunomatagawa Formation Ministry of International Trade and Industry, 1969

Synonym: Yunomatagawa Dacitic Tuff Member

• Type locality: Yunomata river, Ohata river, Ohata town, Mutsu city, Aomori prefecture
• Volcanic rocks
• Miocene
• Correlation: Lower Wakinosawa Andesites

• Sedimentary facies: Terrestrial
• Lithofacies: Dacitic tuff, Tuff breccia
• Lithofacies (Minor): Sandstone, Shale, Andesite lava, Welded tuff

• Thickness: 300 m or thicker
• Upper limit: Unconformity (Ikokuma Andesites)
• Lower limit: Conformity (Ohatagawa Green Tuff Member), Unconformity (Yunokogawa Formation)

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

• Distribution: Yagen hot spring, Yagen, Ohata town, Mutsu city, Aomori pref.; Yunomata river, Ohata river, Ohata town, Mutsu city, Aomori pref.; Yunoko river, Yunokawa, Kawauchi town, Mutsu city, Aomori pref.

• Uemura (1975) Geology of the Mutsukawauchi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 39p. (in Japanese with English abstract 7p.)
• Uemura (1962) Oma and Sai, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 39p. (in Japanese with English abstract 6p.)
• Uemura and Saito (1957) Ohata, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 31p. (in Japanese with English abstract 8p.)