Kaizara Shale Member

Invalid synonym: Kaizara Formation, Nagano Formation, Kurotodo Formation

Coherent formation
Middle - Late Jurassic
Intruded by: Gabbroic porphyry dikes

Sedimentary facies: Marine
Lithofacies: Shale
Lithofacies (Minor): Sandstone

Thickness: ca. 200 - 300 m
Upper limit: Conformity (Yambarazaka Alternation Member)
Lower limit: Conformity (Kamiwakago Conglomerate Member)

Shimoanama Formation
[ Upper ]
~~~~~~~~~~~~~~
Yambarazaka Alternation Member
--------------
Kaizara Shale Member
--------------
Kamiwakago Conglomerate Member
--------------
[ Lower ]

Kuzuryu Group (Ono, Fukui pref.)
[ Upper ]
~~~~~~~~~~~~~~
Shimoanama Formation
--------------
Arashimadani Formation
~~~~~~~~~~~~~~
[ Lower ]

------ 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.)