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Tomegaya Formation Kitamura et al., 1986

Invalid synonym: Hanaremori Formation

• Type locality: Tomegaya, Tagajo city, Miyagi prefecture
• Coherent formation
• Pliocene
• Correlation: Dainenji Formation

• Sedimentary facies: Marine
• Lithofacies: Sandstone
• Lithofacies (Basal): Conglomerate
• Sedimentary structures: Cross stratification, Bioturbation, Pipe rocks

• Thickness: 6 - 7 m
• Lower limit: Unconformity (Rifu Formation, Shiogama Formation, Sauramachi Formation, Tsurugaya Andesite Member, Kasagami Formation, Tatsunokuchi Formation)

• Distribution: Tomegaya - Takasaki, Tagajo city, Miyagi pref.; Jusanzuka - Hanaremori, Rifu city, Miyagi county, Miyagi pref.
• Fossils: Balanus sp., Boring shells
• Fossils (Shellfishes): Acmaea sp., Anadara sp., Crassostrea sp., Glycymeris? sp., Saccella sp.
• Fossils (Diatoms): Actinocyclus octonarius, Actinoptychus senarius, Actinoptychus splendens, Aulacosira granulata, Auliscus caelatus, Aulacosira granulata, Cocconeis scutellum, Coscinodiscus oculus-iridis, Cyclotella sp., Diploneis smithii, Epithemia sp., Epithemia sp., Fragilaria sp., Navicula sp., Nitzschia punctata, Opephora mrtyi, Paralia sulcata, Pinnularia sp., Rhizosolenia sp., Stephanodiscus niagarae, Stephanopyxis sp., Synedra ulna, Thalassionema nitzschioides, Thalassiosira antiqua

• Kitamura et al. (1986) Geology of the Sendai District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 134p. (in Japanese with English abstract 9p.)
• Ishii et al. (1983) Geology of the Shiogama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 6p.)
• Ishii et al. (1982) Geology of the Matsushima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 121p. (in Japanese with English abstract 9p.)