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Kozawa Formation Kitamura et al., 1959

Yunokogawa Formation is a part of this formation.

• Type locality: Kozawa, Wakinosawa, Mutsu city, Aomori prefecture
• Coherent formation
• middle - late Miocene (Foraminifera)
• Correlation: Oma Formation, Wadagawa Formation

• Lithofacies (Upper): Pumiceous tuff, Diatomaceous siltstone, Pumiceous tuff
• Lithofacies (Lower): Shale
• Lithofacies (Lower, Minor): Mudstone, Pumiceous tuff, Andesite lava

• Thickness: 150 - 450 m or thicker
• Upper limit: Interfingered (Wakinosawa Andesites)
• Lower limit: Conformity (Hinokigawa Formation)

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

• Distribution: Kozawa - Kinami - Takoda - Anama, Wakinosawa, Mutsu city, Aomori pref. - Kawauchi river, Kawauchi town, Mutsu city, Aomori pref.
• Fossils: Foraminifera (Haplophragmides sp., Haplophragmoides cf. emaciation, Martinottiella communis, Cyclamina cf. ezoensis, Spirosigmoilinella compressa)

• Uemura (1976) Geology of the Wakinosawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 14p. (in Japanese with English abstract 3p.)
• Uemura (1975) Geology of the Mutsukawauchi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 39p. (in Japanese with English abstract 7p.)