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Furuma Formation (Suzuki, 1966)
- Sedimentary facies: Lacustrine
- Lithofacies: Sands, Silt, Gravels
- Lithofacies (Minor): Peat
- Thickness: 8 m or thicker
- Thickness (Peat): 3.5 m
- Lower limit: Conformity (Kannoki Formation)
- Furuma Formation
- [ Upper ]
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- Furuma Peat Member
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Furuma, Shinano city, Kamiminochi county, Nagano pref.
- Fossils: Seeds (Menyanthes trifolita), Pollen (Picea sp.)
- Fossils (Diatoms): Diploneis ovali, Fragilaria intermedia, Gomphonema parvulum
- Tephra: Kannoki Scoria, DKP
- Nagamori et al. (2003) Geology of the Togakushi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 109p. (in Japanese with English abstract 3p.)