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Nakayama Formation (Masuda, 1953) Takizawa et al., 1984

• Type locality: 1 chome, Nanko town, Ishinomaki city, Miyagi prefecture
• Coherent formation
• Pliocene (Diatoms)

• Sedimentary facies: Marine
• Lithofacies: Sandstone-dominant interbedded sandstone and siltstone
• Sedimentary structures: Cross stratification, Bioturbation

• Thickness: ca. 8 m
• Lower limit: Unconformity (Kakeyama Conglomerate Member)

• Distribution: Nanko town - Hiyorigaoka, Ishinomaki city, Miyagi pref.
• Fossils: Crabs, Corals
• Fossils (Shellfishes): Balanus sp., Chlamys kaneharai, Flabellum sp., Macoma incongrua, Mactra sp., Venus sp.
• Fossils (Diatoms): Achnanthes sp., Actinocyclus ingens, Actinoptychus undulatus, Actinoptychus splendens, Arachnidiscus sp., Aulacosira granulata, Auliscus caelatus, Bacillaria paradoxa, Biddulphia? sp., Coccones costata, Cocconeis scutellum, Coscinodiscus marginatus, Cyclotella kützingiana, Cymbella spp., Delphineis surirella, Denticulopsis kamtschatica, Diploneis smithii, Epitheia spp., Eunotia sp., Grammatophora sp., Hyalodiscus sp., Melosira sulcata, Navicula spp., Nitzschia puncata, Nitzschia reinholdii, Paralia sulcata, Rhaphoneis spp., Rhizosolenia spp., Stauroseis sp., Stephanodiscus cf. hantzschii, Stephanopyxis spp., Thalassionema nitzschioides, Thalassiosira zabelina, Thalassiothrix longissima

• Takizawa et al. (1984) Geology of the Ishinomaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 7p.)