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Kiritani Formation Imamura, 1933
Invalid synonym: Kiridani Alternation, Ushioi Conglomerate
Named as Kiritani although the location name is Kiridani.
- Type locality: Omata valley, Yatsuo village, Toyama city, Toyama prefecture
- Coherent formation
- Late Jurassic, Oxfordian (Ammonoids)
- Correlation: Arimine Formation
- Sedimentary facies: Marine
- Depth of water: Shallow (shallower than Arimine Formation)
- Lithofacies (Upper): Interbedded sandstone and siltstone, Siltstone
- Lithofacies (Upper, Minor): Sandstone
- Lithofacies (Middle): Interbedded sandstone and shale
- Lithofacies (Lower): Sandstone
- Lithofacies (Lower, Minor): Conglomerate, Shale
- Thickness: 72 m
- Distribution (Width): ca. 400 - 500 km
- Upper limit: Unconformity (Ioridanitoge Formation)
- Lower limit: Thrust (Granitoids, Gneiss)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Omata valley - Kubusu river, Yatsuo village, Toyama city, Toyama pref.
- Fossils: Plesiosaurians (Teeth), Fish scales (Semionotidae gen. et sp. indet), Belemnoids, Charales, RadiolariansASponges (Rhaxella)AForaminifera, Plants (Podozamites? sp.)
- Fossils (Shellfishes): Astarte sp., Comptonectes? sp., Fimbria sp., Gastropods, Gupiteria? sp., Myophorella (Promyophorella) imamurai, Mytilus? sp., Nipponitrigonia sagawai sagawai (Yehara), Nucula sp., Nuculana (Praesaccella) sp., Pholadomya? sp., Pinna sp., Plicatula sp.
- Fossis (Ammonoids): Perisphinctes (Dichotomosphinctes) kiritaniensis (Sato), Perisphinctes (Dichotomosphinctes) cf. planus, Lithacoceras sp.
- Fossils (Crinoids): Isocrinus? sp., Apiocrinidae gen. et sp. indet
- Fossils (Trace): Burrows (Planolites-type, Schaubcylindrichnus-type)
- Matsukawa et al. (2014) Jour. Geol. Soc. Japan, vol.120, no.5, pp.147-164 DOI
- Hirasawa et al. (2010) Jour. Geol. Soc. Japan, vol.116, Supplement, pp.103-121 DOI
- Nozawa et al. (1981) Geology of the Shirokimine District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 10p.)