Oro Formation

Type locality: Oro - Kamitani, Fukuchiyama city, Kyoto prefecture
Coherent formation
early - middle Triassic, Olenekian - Ladinian
Correlation: Waruishi Formation

Sedimentary facies: Marine
Lithofacies (Top, Minor): Sandstone
Lithofacies: Shale, Sandy shale

Thickness: 530 m or thicker
Lower limit: Conformity (Ichio Formation)

Yakuno Group (Kawanishi, Kyoto pref.)
[ Upper ]
/--/--/--/--/-
Oro Formation
--------------
Ichio Formation
/--/--/--/--/-
[ Lower ]

Central zone (Kyoto - Hyogo)
[ Upper ]
/--/--/--/--/-
Nabae Group
?--?--?--?--?-
Yakuno Group
~~~~~~~~~~~~~~
Maizuru Group
/--/--/--/--/-
[ Lower ]

Maizuru Belt
[ North ]
/--/--/--/--/-
North zone
/--/--/--/--/-
Central zone
/--/--/--/--/-
South zone
/--/--/--/--/-
[ South ]

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

Distribution: Oro - Kamitani, Fukuchiyama city, Kyoto pref.
Fossils (Upper): Monophyllites cf. sphaerophyllus
Fossils (Lower): Paratirolites? sp., Pelecypods, Isocrinus (Stem), Echinoids
Fossils (Upper, Shellfishes): Daonella? sp., Nuculana nogamii, Palaeoneilo sp.
Fossils (Lower, Shellfishes): Bakevellia kambei, Entolium cf. discites, Eumorphotis aff. tenuistriata, Neoschizodus cf. laevigatus, Nuculana aff. excavata, Nuculana nogamii, Nuculopsis (Palaeonucula) sp., Palaeoneilo sp., Pecten ussuricus, Pinna muikadaniensis, Sisenna? japonica
Fossils (Lower, Brachiopods): Rhynchonella sp., Spiriferina sp.

Igi and Kuroda (1965) Oeyama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 81p. (in Japanese with English abstract 12p.)