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b3 Member
Synonym: U-IIb3
- Coherent formation
- Late Cretaceous, Campanian
- Sedimentary facies: Marine
- Lithofacies: Mudstone
- Thickness: 270 m or thicker
- Upper limit: Conformity
- Lower limit: Conformity
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Shimokoshikijima island, Koshikijima islands, Satsumasendai city, Kagoshima pref.
- Fossils: Bivalives (Sphenoceramus schmidti)
- Tonai et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.11, pp.547-559 DOI