Narahara Formation

Type locality: Narahara, Oe town, Fukuchiyama city, Kyoto prefecture
Coherent formation
early - middle Triassic, Olenekian - Anisian
Contemporaneous heterotopic facies: Hirobatake Formation

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

Thickness: 370 m or thicker
Lower limit: Unconformity (Maizuru Group)

Yakuno Group (Kawahigashi, Kyoto pref.)
[ Upper ]
/--/--/--/--/-
Narahara Formation
/--/--/--/--/-
Hirobatake 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: Narahara, Oe town, Fukuchiyama city, Kyoto pref.
Fossils: Michelinocera sp., Ophiceras sp., Isocrinus (Stem)
Fossils (Shellfishes): Anodontophra? sp., Bakevellia kambei, Bakevellia narawarensis, Bakevellia okuyamensis, Bakevellia tsuzuradaniensis, Claraia aff. decidentes, Claraia okuyamensis, Dentalium sp., Lima? sp., Neoschizodus cf. laevigatus, Nuculana aff. excavata, Palaeoneilo cf. elliptica, Pecten cf. sojalis, Pecten cf. ussuricus, Sisenna? japonica
Fossils (Brachiopods): Lingula cf. borealis, 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.)