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Tatenosawa Sandstone Member Yanagisawa et al., 1996

• Type locality: Tatenosawa, Koike, Soma city, Fukushima prefecture
• Coherent formation
• Late Jurassic, Kimmeridgian (Ammonoids)

• Sedimentary facies: Marine
• Depth of water: Shallow, Swift current
• Lithofacies (Top): Muddy sandstone
• Lithofacies: Sandstone

• Thickness: ca. 180 m
• Upper limit: Transitional
• Lower limit: Conformity

• Distribution: Nakanosawa, Tomizawa, Soma city, Fukushima pref.; Tatenosawa, Koike, Soma city, Fukushima pref.
• Fossils: Ammonoids, Gastropods
• Fossils (Reptiles): Crocodiles (Lower jaw, Teeth), Pliosaurus (Teeth), Plesiosaurus (Teeth)
• Fossils (Crustaceans): Enoploclytia? sp. (Claw), Crayfish ( Eryma? sp., Protaxius sp.), Crab (Glyphea sp., Planoprosopon kashimaensis)
• Fossils (Bivalves): Astarte kambarensis, Astarte somensis, Coelastarte ogawensis, Goniomya nonvscripta, Grammatodon densistriatus, Grammatodon takiensis, Linotrigonia prima, Opertochasma somensis, Opistorinosuensis, Plagiostoma enormicosta, Radulopecten ogawensis, Somarctica abukumensis, Somapecten kamimanensis

• Taketani and Osozawa (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.68-81 DOI
• Yanagisawa et al. (1996) Geology of the Somanakamura District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 9p.)