Ichio Formation

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Ichio Formation

Type locality: Ichio - Nagao, Fukuchiyama city, Kyoto prefecture
Coherent formation
early - middle Triassic, Olenekian
Correlation: Honodani Formation

Sedimentary facies: Marine
Sedimentary facies: Delta
Lithofacies: Sandstone
Lithofacies (Minor): Shale, Conglomerate

Upper limit: Conformity (Oro 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: Ichio - Nagao, Fukuchiyama city, Kyoto pref.; Gujo, Oe town, Fukuchiyama city, Kyoto city
Fossils: Meekoceras? sp., Isocrinus (Stem)
Fossils (Shellfishes): Bakevellia kambei, Neoschizodus cf. laevigatus, Nuculana aff. excavata, Nuculopsis (Palaeonucula) sp., Palaeoneilo sp., Pinna muikadaniensis, Pteria 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.)