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b Member
Synonym: U-IIIb
- Coherent formation
- Late Cretaceous
- Sedimentary facies: Marine, Brackish, Fluvial
- Sedimentary facies: Sandbar, River backmarsh
- Depth of water: Shallow
- Lithofacies: Sandstone, Sandy mudstone, Interbedded sandstone and mudstone
- Sedimentary structures: Large cross-stratification, Trough cross-stratification
- Thickness: 100 m or thicker
- Upper limit: Conformity
- Lower limit: Conformity
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Cape Kumagase, Shikashima, Shimokoshikijima island, Koshikijima islands, Satsumasendai city, Kagoshima pref.
- Fossils: Crassostrea sp., Corbula ushibukensis, Turtles (Shells), Thalassinoides isp.
- Komatsu et al. (2014) Jour. Geol. Soc. Japan, vol.120, Supplement, pp.19-39 DOI
- Tonai et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.11, pp.547-559 DOI