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Hachioji Formation Yasui et al., 1983
- Depth of water: Lower sublittoral - Upper bathyal
- Lithofacies (Top): Interbedded sandstone and mudstone
- Lithofacies: Sandy siltstone
- Lithofacies (Minor): Sandstone
- Sedimentary structures: Parallel stratification
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Doguchi river, Hachioji, Oguni town, Nagaoka city, Niigata pref.; Takanosu - Hirotagawa, Kashiwazaki city, Niigata pref.
- Fossils: Pollen
- Fossils (Shellfishes): Acila (Truncacila) nakazimai, Acila (Truncacila) insignis, Acmaea pallida, Alvania sp., Anadara amicula, Anisocorbula venusta, Antiplanes contraria, Arca sp., Arcopsis symmetrica, Cancellaria japonica lischkei, Cardiomya (Cardiomya) cf. tosaensis, Chlamys cosibensis, Cocculina japonica, Crenulilimopsis oblonga, Cryptonatica janthostoma, Glycymeris yessoensis, Limopsis tokaiensis, Lucinoma annulata, Macoma (Macoma) incongrua, Mitrella sp., Mizuhopecten yessoensis, Modiolus difficilis, Modiolus margaritaceus, Mohnia ozawai, Nitidotellina sp., Notoacmaea sp., Nuculana (Thestyleda) yokoyamai, Ophiodermella miyatensis, Porterius dalli, Propebella candita, Recticunassa sp., Rectiplanes sanctioannis, Serpulorbis imblicatus, Solamen spectabilis, Turritella saishuensis motidukii, Yoldia (Cnesterium) notabilis
- Fossils (Foraminifera): Ammonia japonica, Ammonia takanobensis, Buccella frigida, Bucella frigida carida, Bulimina marginata, Bulimina nojimaensis, Cassidulina norcrossi, Cassidulina yabei, Cibicides cf. reflugens, Cibicides ungerianus, Cribrononion clabatum, Cribrononion subglanulosum, Cribrostomoides cf. subglobosum, Epistominella pulchella, Florilus japonica, Globigerina bulloides, Globigerina incompta, Globigerina pachyderma, Globigerina quinqueloba, Globocassidulina subglobosa, Globoquadrina kagaensis, Islandiella japonica, Oridorsalis umbonatus, Pseudorotalia gaimardii, Pullenia apertula, Siphogenerina saphanus, Trifarina kokozuraensis, Uvigerina subperegrina
- Tephra: Ksp, Hog a, Hog b, Hog c
- Kobayashi et al. (1995) Geology of the Kashiwazaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 102p. (in Japanese with English abstract 4p.)
- Kobayashi et al. (1989) Geology of the Okanomachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 5p.)