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Kawaguchi Formation Kanehara, 1940
- Type locality: Shinano river, Nishikura, Kawaguchi town, Nagaoka city, Niigata prefecture
- Coherent formation
- early Pliocene
- Correlation: lower Nishiyama Formation, middle Kakuma Formation
- Sedimentary facies: Submarine fan complex developed at the flank of eastern continental slope, or a micro-continental raise.
- Sedimentary facies: Turbidite
- Lithofacies: Sandstone-dominant interbedded sandstone and mudstone, Mudstone
- Lithofacies (Minor): Dacite volcanic breccia
- Sedimentary structures: Parallel stratification, Cross stratification, Slump structures, Flute marks, Ripple marks
- Paleocurrent: East to West
- Distribution: Shinano river, Nishikura, Kawaguchi town, Nagaoka city, Niigata pref.; Tenno - Oshima, Kawaguchi town, Nagaoka city, Niigata pref.; Tanesuhara - Katsuraya, Yamakoshi, Nagaoka city, Niigata pref.; Fukuyamashinden, Uonuma city, Niigata pref.; Koguriyama - Nobe river - Nigoro, Ojiya city, Niigata pref.
- Fossils (Shellfishes): Acila insignis, Anadara amicula elongata, Cryptonatica janthostomoides, Felaniella usta, Glycymeris cf. nakamurai, Glycymeris yessoensis, Lucinoma annulata, Megayoldia thraciaeformis, Mercenaria yokoyamai, Nuculana sp., Turritella saishuensis, Umbonium akitanum, Venericardia cf. kiiensis
- Fossils (Foraminifera): Ammobacutites catenttlatus, Ammonia cf. ketienjiensis, Baggina totomiensis, Bolivina robusta, Bolivinita quadrilatera, Buccella frigida, Buccella frigida calida, Bulimina aculeata, Bulimina marginata, Bulimina nojimaensis, Buliminella elegantissima, Cassidulina cf. margareta, Cassidulina norcrossi, Cassidulina yabei, Cibicides aknenianus, Cibicides lobatulus, Cibicides pseudoungerianus, Cibicides cf. tenuimargo, Cribroelphidium yabei, Cribrononion clavatum, Cribrostomoides cf. evoluta, Cribrostomoides cf. renzi, Cribrostomoides cf. subglobosum, Cyclammina cancellata, Cyclammina japonica, Dentalina hyugaensis, Discopulvinulina bertheloti, Discopulvinulina cf. isabelleana, Elphidium clavatum, Elphidium ozawai, Elphidium cf. subincertum, Epistominella cf. japonica, Epistominella pulchella, Eponides umbonatus, Fissulina echigonesis, Florilus japonica, Florilus manpukujiense, Gaudryina robusta, Gaudryinella hanzawai, Globigerina bulloides, Globigerina foliata, Globigerina pachyderma, Globigerina quinqueloba, Globigerinita uvula, Globobulimina auriculata, Globobulimina perversa, Globocassidulina depressa, Globocassidulina subglobosa, Globoquadrina asanoi, Globoquadrina kagaensis, Globorotalia inflata, Globolotalia inflata praeinflata, Globorotalia orientalis, Guttulina cf. kishinouyi, Guttulina yabei, Haplophragmoides compressum, Haplophragmoides cf. emaciatum, Haplophragmoides trullissatum, Islandiella asanoi, Islandiella japonica, Loxostoma sp., Martinottiella communis, Melonis nicobarense, Melonis pompilioides, Miliammina echigoensis, Neogloboquadrina sanoi, Neogloboquadrina himiensis, Neogloboquadrina kagaensis, Neogloboquadrina pachyderma, Nonionella cf. miocenica stella, Nonion nakasaense, Nonion pompilioides, Orbulina universa, Oridorsalis umbonatus, Planulina sp., Polymorphina cf. charlollensis, Proteonina compressa, Pseudononion sp. Pullenia apertula, Pullenialina sp., Pyrgo cf. depressa, Quinqueloculina cf. contorta, Quinqueloculina elongata, Quinqueloculina seminutum, Quinqueloculina subagglutinata, Quinqueloculina vulgaris, Rectobolivina sp., Sigmomorphina cf. ozawai, Spheroidina cf. compacta, Trifarina hughesi, Triforina kokozuraensis, Uvigerina akitaensis, Uvigerina asanoi, Uvigerina excellens, Uvigerina nitidula, Uvigerina subperegrina, Uvigerina wakimotoensis, Uvigerina yabei, Valvulineria sadonica
- Fossils (Nannofossils): Braarudosphaera bigelowii, Calcidiscus leptororus, Coccolithus neohelis, Coccolithus pelagicus, Crenalithus doronicoides, Crenalithus productellus, Emiliania aff. annula, Florisphaera profunda, Helicosphaera carteri, Helicosphaera sellii, Helicosphaera wallichii
- Tephra: NA21B, NA22A, NA23, NA24, NA25, NA26, NA27, NA28, NA29, NA30, NA31, NA32, NA33, NA34, NA35, NA37, NA38, NA39, NA40, NA41, NA42, NA43, NA44, NA45, NA46, NA50, NA60, OK-2
- Kobayashi et al. (1991) Geology of the Nagaoka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 132p. (in Japanese with English abstract 6p.)
- Yanagisawa et al. (1986) Geology of the Ojiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 177p. (in Japanese with English abstract 6p.)