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Kurosaki Formation Fujioka, 1960

• Type locality: Kurosaki, Iwasaki, Fukaura city, Nishitsugaru county, Aomori prefecture
• Coherent formation
• Miocene
• Correlation: Tanosawa Formation?

• Lithofacies (Upper): Mudstone
• Lithofacies (Middle): Conglomerate
• Lithofacies (Lower): Acidic pumice tuff

• Thickness: 150 m or thicker
• Upper limit: Conformity (Juniko Tuff Member)

• Distribution: Kurosaki, Iwasaki, Fukaura city, Nishitsugaru county, Aomori pref.
• Fossils (Shellfishes): Arca aff. miyatensis, Glycymeris vestitoides, Acila (Truncacila) sp., Yoldia tokunagai, Nuculana confusa, Nuculana inermis, Nuculana nidatoriensis, Mytilus grayanus, Placopecten protomollitus, Lyropecten S-hataii, Chlamys arakawai, Chlamys cosibensis, Chlamys cfr. kaneharai, Chlamys nisataiensis, Chlamys swiftii, Chlamys cosibensis hanzawae, Monia macrochisma, Astarte sp., Cyclocardia sp., Lucinoma acutilineata, Clinocardium asagaiensis, Clinocardium shinziensis, Clementa sp., Ostrea rosacea, Macoma sejugata, Trapezium sp., Hallites sp., Tectura asmiiformis, Cellana sp., Puncturella aff. nobilis, Neptunea modesta, Eunaticina sp., Ancistrolepis sp., Propebela sp., Patinopecten sp., Ostrea sp.
• Fossils (Diatoms): Actinoptychus splendens, Aulacodiscus sp., Cocconeis costata, Cocconeis scutellum, Coscinodiscus curvatulus, Coscinodiscus lineatus, Coscinodiscus marginatus, Coscinodiscus oculus iridis, Coscinodiscus radiatus, Coscinodiscus stellaris, Denticula hustedtii, Denticula kamtschatika, Diploneis smithii, Grammatophora arcuata, Melosira granulata, Melosira sulcata, Stephanopyxis turris, Thalassiosira antiqua, Thalassiosira deciplens, Thalassiosira kryophila, Thalassiosira manifesta, Thalassiosira nidulus, Thalassiosira excentricus, Thalassionema nitzschioides

• Moritani (1968) Geology of the Fukaura District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 57p. (in Japanese with English abstract 5p.)