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Arimagawa Mudstone Member Akahane, 1975
- Type locality: Kuwatori river, Arimagawa - Shimotsunako, Joetsu city, Niigata prefecture
- Coherent formation
- Rift basin sediments
- Pliocene
- Sedimentary facies: Marine
- Depth of water: Continental shelf
- Depth of water: Lower sublittoral zone (50 - 250 m, Shellfishes)
- Lithofacies: Mudstone, Interbedded sandstone and mudstone
- Lithofacies (Minor): Tuff, Sandstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Nadachi river - Kuwatori river, Joetsu city, Niigata pref.
- Fossils (Omma-Manganji fauna): Acila (Acila) divaricata, Acila (Acila) vigilia, Acila (Truncacila) nakazimai, Acmaea (Niveotectura) sp., Anadara (Anadara) cf. amicula, Antiplanes contraria, Arca boucardi, Bittium horinjiensis, Boreotrophon candelabrum, Buccinum sp., Callista chinensis, Chlamys (Chlamys) cosibensis, Chlamys (Chlamys) cf. nipponensis, Clinocardium (Ciliatocardium) sp., Conchocele bisecta, Crenulilimopsis oblonga, Cryptonatica janthostomoides, Cyclocarida ferruginea, Cyclocardia isaotakii, Dentalium octangulatum, Empleconia cumingii, Ennucula tenuis, Euspira pila, Glycymeris (Glycymeris) sp., Granotoma dissoluta, Homalopoma amussitatum, Huxleyia sp., Laevidentalium sp., Limopsis (Limopsis) tokaiensis, Littorina (Littorina) sitkana, Lucinoma sp., Macoma (Macoma) calcarea, Malletia? sp., Megacardita sp., Mercenaria sp., Miodontiacus prolongata nakamurai, Modiolus margaritaceus, Myadora fluctuosa, Mytilidae gen. et sp. indet, Neadmete sp., Nemocardium samarangae, Neptunea? sp., Notoacmaea schrencki, Nuculana (Thestyleda) yokoyamai, Odostomia sp., Oenopota cf. nakamurai, Ophiodermella ogurana, Pandora (Pandorella) wardiana, Periploma sp., Peronidia zyonoensis, Portlandia (Portlandia) japonica, Portlandia (Portlandia) toyamaensis, Propebela (Turritoma) sp., Protothaca euglypta, Puncturella sp., Rectiplanes sanctiioannis, Reticunassa cf. spurea, Retusa sp., Robaia robai, Saxidomus? sp., Serripes sp., Striodentalium rhabdotum, Suavodrillia declivis, Swiftopecten? sp., Thyasira tokunagai, Tridonta (Tridonta) alaskensis, Tridonta (Tridonta) filatovae, Trophonopsis cf. scitulus, Tucetonella munda, Turbonilla sp., Turritella (Neohaustator) saishuensis, Umbonium (Suchium) akitanum, Venus? sp.
- Akahane and Kato (1989) Geology of the Takada-Seibu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 89p. (in Japanese with English abstract 3p.)