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Uwa Formation Kawamura and Shinohara, 2008
- Type locality: Iwaki, Nishiyamada, Uwa town, Seiyo city, Ehime prefecture
- Coherent formation
- Forearc basin sediments
- Pleistocene - Holocene (1.3 - ? Ma, Tephra)
- Upper: late Pleistocene - Holocene
- Middle: middle - late Pleistocene
- Lower: early - middle Pleistocene (1.0 - 0.33 Ma, Tephra)
- Lowermost: early Pleistocene (1.3 - 1.0 Ma, Tephra)
- Correlation: Middle terrace deposit
- Sedimentary facies: Terrestrial
- Lithofacies (Upper): Interbedded clay and sands-granvels
- Lithofacies (Middle): Clay, Silt
- Lithofacies (Middle, Minor): Humic
- Lithofacies (Lower): Interbedded clay and sands-gravels
- Lithofacies (Lowermost): Clayey - silty sands and gravels
- Thickness: 74 - 95 m
- Thickness (Upper): ca. 5 - 20 m
- Thickness (Middle): 13 - 21 m
- Thickness (Lower): 30 - 40 m
- Thickness (Lowermost): 0 - 25 m
- Lower limit: Unconformity (Togano Unit (as Iwaki Formation))
- Uwa Formation
- [ Upper ]
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- Upper part
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- Middle part
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- Lower part
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- Lowermost part
- ~~~~~~~~~~~~~~
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Uwa town, Seiyo city, Ehime pref.
- Fossils (Lower, Lowermost): Tree roots
- Tephra (Lower): Uw-13 (1.0 Ma), Uw-14 (0.87 Ma?), Uw-15, Uw-19, Uw-20, Uw-21 (0.6 Ma?), Uw-22, Uw-23 (0.57 Ma), Uw-24 (0.53 - 0.52 Ma), Uw-25, Uw-26 (0.4 - 0.32 Ma)
- Tephra (Lowermost): Uw-1 (1.3 - 1.2 Ma), Uw-2, Uw-3
- Kawamura and Shinohara (2008) Jour. Geol. Soc. Japan, vol.114, no.8, pp.415-425 DOI