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U-IV Formation
- Coherent formation
- Late Cretaceous middle Campanian - Paleogene?
- Sedimentary facies: Marine, Terrestrial
- Sedimentary facies: Continental slope
- Sedimentary facies: Debris flow, Slump
- Lithofacies: Mudstone
- Lithofacies (Minor): Gravel-bearing mudstone, Conglomerate
- Thickness: 1,340 m
- Upper limit: Conformity
- Lower limit: Conformity
- U-IV Formation
- [ Upper ]
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- c Member
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- b Member
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- a Member
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Taira, Nakakoshikijima island, Koshikijima islands, Satsumasendai city, Kagoshima pref.
- Fossils: Theropoda (Teeth, Bones), Adocus sp., Carettochelyidae gen. et sp. indet, Turtles (Shells), Crocodiles (Teeth, Skins), Fishes
- 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