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Tateya Mudstone Member Kanno and Arai, 1964
Invalid synonym: Tenjinbashi Formation
- Type locality: Akikawa river, Kosho, Akiruno city, Tokyo
- Coherent formation
- middle Miocene
- Lithofacies: Siltstone, Claystone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Akikawa river, Kosho - Tennozawa, Akiruno city, Tokyo; Sakamoto - Tamanouchi, Oguno, Hinode city, Nishitama county, Tokyo
- Fossils: Echinoids, Crabs, Fish scales, Ophiuroids
- Fossils (shellfishes): Acila eximia, Akebiconcha chilanii, Conchocele disjuncta, Dentalium yokoyamai, Lucinoma cf. hannibali, Macoma aff. calcarea, Malletia (Neilo) inermis, Malletia (Neilo) kurasiensis, Nuculana cf. robai, Portlandia (Hataiyoldia) tokunagai, Portlandia lanceolata, Solemya (Acharax) tokunagai, Turritella itsukaichiensis, Venericardia (Cyclocarida) siogamensis, Yoldia sagittaria
- Fossils (Foraminifera): Ammonia beccarii, Brizalina piseiformis, Buccella akahiraensis, Cribroelphidima yabei, Cyclammina pusilla, Globobulimina sp., Gyroidina altiformis, Haplophragmoides sp., Lenticulina sp., Nodosaria sp., Nonionella miocenica
- Fossils (Calcareous nannofossils): Cyclicargolithus floridanus, Discoaster deflandrei
- Ueki and Sakai (2007) Geology of the Ome District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 189p. (in Japanese with English abstract 5p.)
- Sakai (1987) Geology of the Itsukaichi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 75p. (in Japanese with English abstract 5p.)