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Iizuka Formation (Mochizuki, 1932) Yoshikawa et al., 2002

Invalid synonym: Iizuka Diatomaceous Mudstone Formation, Wakayama Formation, upper Najimi Formation, Kumandani Member

Invalid synonym (Top): Kumandani Member

• Type locality: Iizuka, Shoin town, Suzu city, Ishikawa prefecture
• Coherent formation
• late Miocene (12.3 - 6.5 Ma; 12.0 Ma, FT)

• Sedimentary facies: Marine
• Lithofacies (Top): Sandy siltstone, Muddy sandstone
• Lithofacies: Siliceous siltstone, Diatomaceous siltstone
• Lithofacies (Minor): Rhyolite tuff

• Thickness: 350 m or thicker
• Thickness (Top): 50 - 80 m or thicker
• Lower limit: Conformity (Iida Formation)

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

• Distribution: Iizuka - Okada, Shoin town, Suzu city, Ishikawa pref.; Misaki town - Wakayama town - Uedo town - Minamikuromaru - Shimizu town, Suzu city, Ishikawa pref.
• Fossils (Top): Trace fossils
• Fossils: Whales, Dolphins, Pinnipeds (Allodesmus sp.), Radiolarians, Pollen
• Fossils (Diatoms): Actinocyclus curvatulus, Actinocyclus ellipticus, Actinocyclus ellipticus var. elongatus, Actinocyclus ingens f. ingens, Actinocyclus ingens f. nodus, Actinocyclus ingens f. planus, Actinocyclus octonarius, Actinoptychus senarius, Arachnoidiscus spp., Aulacoseira spp., Azpeitia endoi, Azpeitia nodulifera, Azpeitia vetustissima, Cavitatus jouseanus, Cavitatus lanceolatus, Cavitatus linearis, Cavitatus miocenicus, Cocconeis californica, Cocconeis costata, Cocconeis curviritunda, Cocconeis scutellum, Cocconeis vitrea, Coscinodiscus marginatus, Coscinodiscus perforatus, Coscinodiscus radiatus, Cladogramma dubium, Clavicula polymorpha, Delphineis surirella, Denticulopsis ichikawae, Denticulopsis dimorpha var. areolata, Denticulopsis katayamae, Denticulopsis lauta, Denticulopsis praehyalina, Denticulopsis simonsenii, Denticulopsis vulgaris, Diploneis bombus, Diploneis smithii, Grammatophora spp., Hemiaulus polymorphus (= Eucampia sp.), Hyalodiscus obsoletus, Ikebea tenuis, Melosira sol, Navicula sp., Nizschia cf. cylindrica, Nitzschia fossiis, Nizschia cf. grunowii, Nizschia pliocena, Nizschia rolandii, Odontella aurita, Parlia sulcat, Plagiogramma staurophorum, Proboscia alata, Proboscia barboi, Pseudopodosira elegans, Rhabdonema japonicum, Rhizosolenia miocenica, Rhizosolenia styliformis, Rouxia califormica, Stellarima microtrias, Stephanogonia hanzawae, Stephanopyxis spp., Thalassionema hirosakiensis, Thalassionema nitzschioides, Thalassionema schraderi, Thalassiosira antiqua, Thalassiosira leptopus, Thalassiosira manifesta, Thalassiosira marujamica, Thalassiosira nidulus, Thalassiosira opposita, Thalassiosir temperei, Thalassiothrix longissima, Trochosira spinosa

• Kano (2018) Jour. Geol. Soc. Japan, vol.124, no.10, pp.781-803 DOI
• Yoshikawa et al. (2002) Geology of the Suzumisaki, Noto-iida and Horyuzan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 76p. (in Japanese with English abstract 4p.)