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Tateyama Formation Kujiraoka, 1953

• Type locality: Tateyama, Sakata city, Yamagata prefecture
• Coherent formation
• late Pliocene
• Correlation: Lower Tentokuji Formation, Nakawatari Formation, Upper Noguchi Formation

• Sedimentary facies: Marine
• Lithofacies: Mudstone
• Lithofacies (Minor): Acidic tuff, Sandstone, Siltstone

• Thickness: 100 - 850 m
• Upper limit: Transitional (Maruyama Formation), Unconformity (Owarabi Debris Avalanche Deposit, Chokai volcano products)
• Lower limit: Top of Tazawa Tuff
• Lower limit: Transitional (Kitamata Formation)

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

• Distribution: Tateyama - Kitamata - Takaoyama - Yamayazutsumi - Endo - Tenpei - Minaminomaeda - Umegasawa - Yamamoto - Yoshigasawa - Onumashinden, Sakata city, Yamagata pref.; Takenokozawa hot spring - Mount Haguro, Tsuruoka city, Yamagata pref.
• Fossils: Fish scales, Sponges (Makiyama chitanii)
• Fossils (Foraminifera): Ammobaculites strathearensis, Ammonia japonica, Bathysiphon sp., Bolivirita quadrilatera, Cassidulina norcrossi, Cibicides pseudoungerianus, Cibicides ungerianus, Cribroelphidium yabei, Cribrostomoides cf. evoluta, Cribrostomoides subglobosum, Cyclammina cancellata, Cyclammina japonica, Cyclammina pusilla, Dentalina frobisherensis, Dorothia sp., Epistominella pulchella, Fissulina sp., Glandulina cuspidata, Globigerina bulloides, Globigerina pachyderma, Globocassidulina subglobosa, Globoquadrina asanoi, Globorotalia inflata, Globorotaria orientalis, Goesella schencki, Haplophragmoides sp., Hormorsina sp., Islandiella japonica, Islandiella margareta, Martinottiella bradyana tarukiensis, Martinottiella communis, Melonis pompilioides, Miliammina echigoensis, Orbulina universa, Oridorsalis umbonatus, Praeglobobulimina pupoides, Pullenia apertula, Sphaeroidina bulloides, Trifarina kokozuraensis, Uvigerina akitaensis, Uvigerina yabei, Valvulineria sadonica
• Fossils (Radiolarians): Anthocarys akitaensis, Cenosphaera yatuoensis, Cromyodruppa concentrica, Cyrtocapsella tetrapera, Flustrella camerina, Flustrella cf. flustrella, Larnacantha elliptica, Larnacantha polyacantha, Lychnocanium nipponicum, Sethocyrtis japonica, Spireuma circularis, Spongodiscus sp., Thecosphaera japonica, Theocorys redondoensis, Theocyrtis redondoensis

• Tsuchiya (1989) Geology of the Osawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 6p.)
• Tsuchiya et al. (1984) Geology of the Tsuruoka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 77p. (in Japanese with English abstract 5p.)
• Ikebe et al. (1979) Geology of the Sakata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 42p. (in Japanese with English abstract 3p.)