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Tsubono Formation (Sumi and Nozawa, 1973) Takeuchi et al., 2017

• Type locality: Tsubono - Utsuro, Uozu city, Toyama prefecture
• Coherent formation
• early - middle Miocene

• Sedimentary facies: Shallow marine
• Lithofacies (Top): Tuffaceous sandstone
• Lithofacies: Sandstone
• Lithofacies (Minor): Pumice tuff, Tuffaceous sandstone, Conglomerate, Gravel-bearing sandstone

• Thickness: several - ca. 120 m
• Upper limit: Conformity (Shakusenji Formation), Unconformity (Takabatake Formation
• Lower limit: Conformity (Gomado Tuff Breccia Member, Kosuganuma Volcanic Breccia Member, Kadogawa Andesite Member), Conformity, partly unconformity (Oiwa Tuff Member), Unconformity (Fukuhira Formation)

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

• Distribution: Tsubono - Utsuro - Kakuma - Ikedani - Tojo - Kitayama, Uozu city, Toyama pref.; Tofukuji, Namerigawa city, Toyama pref.; Higaidani - Goio - Shakusenji - Suyama, Kamiichi city, Nakaniikawa county, Toyama pref.
• Fossils: Foraminifera, Sponges (Spicules), Plant fragments
• Fossils (Shellfishes): Acila sp., Amusium sp., Chlamys kaneharai, Cirripedia, Clinocardium sp., Kotorapecten kagamianus, Lucinoma sp.

• 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.)
• Sumi and Nozawa (1973) Geology of the Uozu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 104p. (in Japanese with English abstract 5p.)