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Yuzawa Formation Shimazu, 1973

• Type locality: Yuzawa creek, Aburuma river, Uonuma city, Niigata prefecture
• Volcanic rocks
• early Miocene
• Intruded by: Rhyolite
• Correlation: lower Otani Formation, lower Anazawa Formation

• Sedimentary facies: Terrestrial
• Lithofacies: Andesite lapilli tuff, Conglomerate, Rhyolite pumice tuff
• Lithofacies (Minor): Andesite lava, Interbedded sandstone and siltstone

• Thickness: 300 - 800 m
• Upper limit: Unconformity (Otani Formation)
• Lower limit: Unconformity (Ashio Belt)

• Distribution: Yuzawa creek - Mount Kemo, Aburuma river, Uonuma city, Niigata pref.; Mount Kabukura, Tadami city, Minamiaizu county, Fukushima pref.
• Fossils: Plants (Myrica naumanni), Trace fossils

• Takahashi et al. (2004) Geology of the Suhara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 80p. (in Japanese with English abstract 4p.)