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Arimine Formation Kawai, 1955

Invalid synonym: Arimine Shale

• Type locality: Higashisakamori valley, Arimine, Toyama city, Toyama prefecture
• Coherent formation
• Late Jurassic, Oxfordian - Kimmeridgian (Ammonoids)
• Correlation: Kiritani Formation

• Sedimentary facies: Marine
• Sedimentary facies: Inner bay (Fossils)
• Depth of water: Shallow
• Lithofacies (Upper): Shale, Shale-dominant interbedded sandstone and shale
• Lithofacies (Lower): Sandstone-dominant interbedded sandstone and shale
• Lithofacies (Lower, Minor): Conglomerate
• Lithofacies (Minor): Felsic volcanic rocks, Andesite (Arimine Acidic Volcanic rocks)

• Thickness: 150 m or thicker
• Upper limit: Unknown
• Lower limit: Conformity (Magawa Formation), Unconformity (Hida Meta-granitoids)

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

• Distribution: Higashisakamori valley - Inone valley, Arimine, Toyama city, Toyama pref., upstream of Magawa river, Toyama pref.; east slope of Yakushi-daira, Toyama pref.
• Fossils: Radiolarians
• Fossils (Bivalves): Nipponitrigonia kobayashii, Myophorella (Promyophorella) toyamensis, Vaugonia ariminensis, Myophorella (Promyophorella) hidensis, Myophorella (Promyophorella) magawensis, Myophorella (Promyophorella) tetoriensis, Inoceramus sp., Pinna sp., Grossovia? sp.
• Fossils (Ammonoids): Kranaosphinctes sp., Perisphinctes spp., Ataxioceras aff. torquatus, Lithacoceras, Perisphinctes (Kranaosphinctes) matsushimai
• Fossils (Plants): Onychiopsis elongata
• Fossils (Trace): Burrows (Skolithos-type, Planolites-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