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Furubo Formation (Kawai, 1957) Nakajima et al., 1981
- Type locality: Sorogawa river, Kamogawa city, Chiba prefecture
- Accretionary complex
- early Miocene (Nannofossils)
- Correlation: Masuma Formation
- Sedimentary facies: Marine
- Water temperature: Cold ocean current
- Lithofacies: Shale
- Lithofacies (Minor): Sandstone, Tuff
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Sorogawa river - Mineoka tunnel - Isomura - Suzume island - Ujima island - Benten island - Arashima island - Hashimoto - Mine - Nunono - Sakamoto - Nishitani - Nishi - Higashimakado, Kamogawa city, Chiba pref.
- Fossls: Foraminifera, Diatoms
- Fossils (Silicoflagellates): Corbisema triacantha, Distephanus crux, Distephnus speculum, Distephanus speculum var. cannopiloides, Distephanus speculum var. pentagonus, Mesocena apiculata, Mesocena quadrangula, Naviculopsis lata, Naviculopsis navicula
- 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.)