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Sasagawa Formation Ichimura, 1935
- Type locality (almost lost): Sasagawa river, Asahi city, Shimoniikawa county, Toyama prefecture
- Coherent formation
- early - middle Miocene
- Contemporaneous heterotopic facies: Hanyu Formation
- Lithofacies: Mudstone (18.2 - 14.0 Ma, FT; 16.2 Ma, U-Pb)
- Lithofacies (Lower, Minor): Rhyolite pumiceous lapilli tuff, Lava, Volcanic conglomerate, Volcanic breccia, Pumiceous tuff breccia
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Sasagawa river - Hirudan - Sakai cold spring, Asahi city, Shimoniikawa county, Toyama pref.
- Fossils: Foraminifera, Plant fragments
- Takeuchi et al. (2017) Geology of the Tomari District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 121p. (in Japanese with English abstract 4p.)