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Suyoshi Formation (Collaborative Research Group for Eastern Marginal Hills of Niigata Plain, 1990) Kobayashi et al., 1991

• Type locality: Suyoshi river, Suyoshi town, Nagaoka city, Niigata prefecture
• Volcanic rocks
• early - late Pliocene
• Interfingered: Kakuma Formation, Minagawa Formation, lower Uonuma Formation
• Correlation: Nishiyama Formation

• Lithofacies: Volcanic sandstone, Hornblende andesite - dacite tuff breccia
• Lithofacies (Minor): Volcanic ash, Lapilli tuff, Mudstone, Volcanic conglomerate, Lava

• Thickness: 0 - 700 m

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

• Distribution: Suyoshi river - Ota river, Suyoshi town, Nagaoka city, Niigata pref.
• produces fossils

• Kobayashi et al. (1991) Geology of the Nagaoka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 132p. (in Japanese with English abstract 6p.)