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Kaizara Shale Member
Invalid synonym: Kaizara Formation, Nagano Formation, Kurotodo Formation
- Coherent formation
- Middle - Late Jurassic
- Intruded by: Gabbroic porphyry dykes
- Sedimentary facies: Marine
- Lithofacies: Shale
- Lithofacies (Minor): Sandstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kaizara - Amagashiradani valley - Otani - Hakogase - Kurotodo - Nagano - Shimoono, Ono city, Fukui pref.
- Fossils: Belemnoids, Estheria sp., Inoceramus sp., Pecten sp., Posidonomya sp., Reineckeia sp., Trigonia sp.
- Fossils (Ammonoids): Arcticoceras sp., Calliphylloceras sp., Karanosphinctes matsushimai, Katroliceras yokoyamai, Kepplerites (Seymourites) acuticostum, Kepplerites (Seymourites) japonica, Kepplerite (Seymourites) kuzuryuensis, Oppelia echizenica, Perisphinctes hikii, Perisphinctes kaizaranus, Perisphinctes kochibei
- Fossils (Plants): Otozamites sp.
- Kawai et al. (1957) Arashimadake, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 110p. (in Japanese with English abstract 13p.)