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Nabuto Formation (Yabe, 1922) Nakajima et al., 1981
Invalid synonym: Takazuruyama Formation
- Type locality: Futomi - Niemonjima island, Kamogawa city, Chiba prefecture
- Accretionary complex
- early Miocene (Nannofossils)
- Correlation: Masuma Formation, Kanigawa Formation
- Sedimentary facies: Marine
- Water temperature: Cold ocean current
- Lithofacies (Upper): Tuff, Sandy tuff, Tuffaceous sandstone
- Lithofacies (Upper, Minor): Shale
- Lithofacies (Lower): Shale
- Lithofacies (Lower, Minor): Turbidite sandstone, Tuff
- Sedimentary structures: Graded bedding, Cross stratification, Parallel stratification
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Futomi - Niemonjima island - Yoshiura, Kamogawa city, Chiba pref.
- Fossils: Foraminifera, Diatoms, Radiolarians
- Fossils (Silicoflagellates): Cannopilus hemisphaericus, Corbisema triacantha, Dictyocha fibula, Distephanus crux, Distephanus crux var. schaunslandii, Distephanus speculum, Distephanus speculum var. cannopiloides, Distephanus speculum var. pentagonus, Macrora stella, Mesocena apiculata, Mesocena quadrangula, Naviculopsis biapiculata Naviculopsis lata, Naviculopsis navicula, Naviculopsis quadratum
- Takahashi et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.8, pp.375-395, DOI
- Nakajima et al. (1981) Geology of the Kamogawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 107p. (in Japanese with English abstract 7p.)