Oriai Formation

Coherent formation
Tethys ocean
Sedimentary basin in the continental slope
Late Jurassic

Sedimentary facies: Marine
Climate: Tropical - Subtropical (Rudist bivalves)

Lithofacies: Mudstone, Interbedded sandstone and mudstone

Imaidani Group
[ Upper ]
?--?--?--?--?-
Nakatsugawa Formation
?--?--?--?--?-
Oriai Formation
?--?--?--?--?-
[ Lower ]

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

Distribution: Oriai, Shirokawa town, Seiyo city, Ehime pref.
Fossils (Torinosu Limestone gravels, Rudist bivalves): Monopleura sp., Epidiceras speciosum

Sano et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.9, pp.500-503 DOI