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Choshi Group
- Type locality: Choshi city, Chiba prefecture
- Coherent formation
- Cretaceous Barremian - Aptian (Ammonoids, Foraminifera)
- Sedimentary facies: Marine
- Sedimentary facies: Offshore, Continental shelf
- Depth of water: Shallow
- Lithofacies: Sandstone
- Lithofacies (Minor): Conglomerate, Siltstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kurohae - Cape Inubo - Nagakihana, Chosi city, Chiba pref.
- Fossils: Ammonoids, Bivalves (Nanonavis yokoyamai), Gastropods, Brachiopods, Corals, Echinoids, Starfishes, Plants, Foraminifera
- Kashiwagi et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.9, pp.647-652 DOI
- Terabe and Matsuoka (2009) Jour. Geol. Soc. Japan, vol.115, no.3, pp.130-140 DOI
- Tazawa and Hasegawa (2007) Jour. Geol. Soc. Japan, vol.113, no.8, pp.406-416 DOI