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Hanyu Formation (Ito, 1985) Takeuchi et al., 2017
- Type locality: Hanyu - Tanayama, Asahi city, Shimoniikawa county, Toyama prefecture
- Coherent formation
- early Miocene (17.5 Ma, FT; 16.2 Ma, U-Pb)
- Contemporaneous heterotopic facies: Sasagawa Formation
- Lithofacies: Tuffaceous sandstone
- Lithofacies (Minor): Muddy sandstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Hanyu - Tanayama - Hirudan, Asahi city, Shimoniikawa county, Toyama pref.; Akebi, Unazuki town, Kurobe city, Toyama pref.
- Fossils: Wood fragments, Teredinidae, Trace fossils
- 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.)