Itsuki Formation

Invalid synonym: Itsuki Shale Member

Type locality: Itsuki, Ono city, Fukui prefecture
Coherent formation
Cretaceous

Sedimentary facies: Terrestrial
Lithofacies: Interbedded shale and sandstone
Lithofacies (Minor): Conglomerate, Shale

Thickness: 80 - 190 m
Upper limit: Conformity (Nochino Conglomerate Member?)
Lower limit: Conformity (Kakunomaesaka Alternation Member)

Itoshiro Subgroup (Ono, Fukui pref.)
[ Upper ]
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Itsuki Formation
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Kakunomaesaka Alternation Member
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Dosaiyama Conglomerate Member
~~~~~~~~~~~~~~
[ Lower ]

Tetori Group
[ Upper ]
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Akaiwa Subgroup
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Itoshiro Subgroup
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Itsuki - Taniyamadani valley - Chinabora - Kuzugahara - Ikegahara - Kakunomaesaka, Ono city, Fukui pref.
Fossils (Shellfishes): Nakamuranaia? sp., Trigonioides sp.
Fossils (Footprints, Theropods): Itsukisauropus izumiensis
Fossils (Footprints, Ornithopods): Shiraminesauropus hayashidaniensis (Iguanodons)
Fossils (Footprints, Birds): Aquatiravipes izumiensis
Fossils (Plants): Cladophlebis distans, Cladophlebis cf. exiliformis, Cladophlebis hukuiensis, Cladophlebis cf. triangularis, Czecanoswkia rigida, Equisetites ushimarensis, Ginkgoidium nathorsti, Ginkgoites? sp., Nilssonia orientalis, Onychiopsis elongata, Podozamites griebachi, Podozamites lanceclatus, Podozamites reinii

Hirasawa et al. (2010) Jour. Geol. Soc. Japan, vol.116, Supplement, pp.103-121 DOI
Kawai (1964) Neo, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 66p. (in Japanese with English abstract 12p.)
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.)