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Sazen Formation (Fujii, 1959) Takeuchi et al., 2017
Invalid synonym: Sangogawa Formation, Nanbo Formation
- Type locality: Sasagawa river, Sazen, Asahi city, Shimoniikawa county, Toyama prefecture
- Coherent formation
- middle Miocene
- Lithofacies: Sandy mudstone
- Lithofacies (Minor): Sandstone, Rhyolite volcanic breccia, Tuff
- Sedimentary structures: Bioturbation
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Sazen - Miyazaki - Ikenohara - Ishitani, Asahi city, Shimoniikawa county, Toyama pref.; Akebi, Unazuki town, Kurobe city, Toyama pref.
- Fossils: Mammalia (Paleoparadoxia tanabei), Sea turtle (Syllomus aegyptiacus), Echinoids, Foraminifera
- Fossils (Shellfishes): Acila sp., Aturia minoensis, Buccinum sp., Conus sp., Ostrea gravitesta, Portlandia sp., Yoldia japonica
- 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.)