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Nigoriike Formation Saito, 1962
Invalid synonym: Komakihara Formation, Nagasawa Formation
- Type locality: Matsuda river, Nigoriike, Iiyama city, Nagano prefecture
- Coherent formation
- late Pliocene
- Correlation: lower Nishiyama Formation
- Intruded by: Andesite dikes
- Sedimentary facies: Marine, Brackish (Diatoms)
- Sedimentary facies: Upper continental slope, Outer continental shelf
- Water temperature (Upper): Warm ocean current
- Depth of water: Lower sublittoral - Upper bathyal
- Lithofacies (Upper): Sandy mudstone
- Lithofacies (Lower): Mudstone
- Sedimentary structures (Upper): Bioturbation
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Matsuda river, Nigoriike, Iiyama city, Nagano pref.; Horikoshi, Iiyama city, Nagano pref.; Goro - Oyakawa - Nashikubo, Toyota, Nakano city, Nagano pref.; Hinata - Horikoshi, Iizuna city, Kamiminochi county, Nagano pref.; Nagasawa, Arai city, Niigata pref.
- Fossils: Trace fossils (Tube-form)
- Fossils (Omma-Manganji fauna): Acila (Truncacila) insignis, Anodontia stearnsiana, Antiplanes contraria, Buccinum spp., Cardiomya gouldiana septentrionalis, Cardium sp., Clementia vatheleti, Cyclina sp., Ennucula nipponica, Glycymeris nipponica, Myadora sp., Mya japonica, Periploma spp., Polinices sp., Polynemamussium intuscostatum, Portlandia (Portlandella) toyamaensis, Robaia robai, Serripes sp., Siliqua sp., Solamen spectabilis, Solen sp., Spisula cf. voyi, Turritella (Neohaustator) saishuensis saishuensis, Yoldia notabilis
- Fossils (Diatoms): Actinocyclus tenerus, Actinoptychus senarius, Aulacoseira spp., Coscinodiscus marginatus, Cyclotella spp., Diploneis spp., Hyalodiscus radiatus, Neodenticula kamtschatica, Paralia sulcata, Rhizosolenia hebetata, Rhizosolenia styliformis, Stephanopyxis spp., Thalassionema nitzschioides, Thalassiosira antiqua, Thalassiosira convexa, Thalassiosira oestrupii
- Yanagisawa et al. (2000) Geology of the Iiyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 144p. (in Japanese with English abstract 6p.)
- Akahane et al. (1992) Geology of the Nakano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 106p. (in Japanese with English abstract 4p.)