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Yokoo Formation (Fujii, 1959) Takeuchi et al., 2017

• Type locality: Takabatake - Ikenohara, Asahi city, Shimoniikawa county, Toyama prefecture
• Coherent formation
• early Pleistocene (2.44 Ma, K-Ar)
• Interfingered (Middle): Miyazaki Formation

• Lithofacies: Sandy mudstone, Muddy sandstone, Sandstone
• Sedimentary structures: Bioturbation

• Thickness: 300 m or thicker
• Lower limit: Unconformity (Takabatake Formation)

• Distribution: Takabatake - Ikenohara - Ogawa river, Asahi city, Shimoniikawa county, Toyama pref.
• Fossils: Shellfishes, Echinoids, Diatoms

• 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.)