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Nuruyu Formation (Sakai, 1961) Muraoka and Hase, 1990
- Sedimentary facies: Marine
- Sedimentary facies (Middle): Submarine scoria fall deposit
- Sedimentary facies (Lower): Submarine pyroclastic flow deposit
- Lithofacies (Upper): Siltstone, Shale
- Lithofacies (Upper, Minor): Sandstone, Gravelly sandstone
- Lithofacies (Middle): Scoriaceous volcanic breccia
- Lithofacies (Lower): Dacitic pumice tuff (Perlite-bearing)
- Lithofacies (Lower, Minor): Siltstone, Shale, Sandstone, Conglomerate, Lapilli tuff
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Nuruyu - Shirasawa, Kuroishi city, Aomori pref.; Minaminakano - Nakano river, Kuroishi city, Aomori pref.; Ho pass, Kuroishi city, Aomori pref.; Yuruyu - Mount Kaifuki, Kuroishi city, Aomori pref.; Asai river, Hirakawa city, Aomori pref.; Sabaishi - Mitsumenai, Owani city, Minamitsugaru county, Aomori pref.; Daibutsu park, Ishikawa, Hirosaki city, Aomori pref.; Matsukitai, Hirosaki city, Aomori pref.; Arakawa river - Nakano river, Aomori city, Aomori pref.; Nakasato river, Towada city, Aomori pref.
- Fossils (Shellfishes): Amussiopecten sp., Anadara (Anadara) ogawai, Anadara? sp., Balanus sp., Callista cfr. mitagaensis, Campages sp., Chlamys (Chlamys) cosibensis hanzawae, Chlamys sp., Clinocardium ciliatum, Diplodonta sp., Dentalium sp., Fulvia sp., Glycymeris ogawaraensis, Glycymeris sp., Hemithyris psitacea, Limopsis sp., Lucinoma sp., Mercenaria sp., Musashia densicostata, Mytilid gen. et sp. indet, Natica spp., Neverita coticazae, Otolithus gen. et sp. indet, Patinopecten matumoriensis, Patinopecten spp., Propeamussium (Parvamussium) masagoi, Ostrea sp., Siphonalia sp., Terebratalia sp. Terebratulina crossei, Turritella fortilirata chikubetsuensis, Venericardia sp., Volsella sp.,
- Fossils (Diatoms): Actinocyclus ingens, Coscinodiscus endoi, Coscinodiscus marginatus, Coscinodiscus oculus-iridis, Coscinodiscus stellaris, Coscinodiscus yabei, Denticula hustedtii, Denticula kamtschatica, Denticula lauta, Rhizosolenia sp., Stephanopyxis turris, Thalassionema nitzschioides, Thalassionema antiqua, Thalassionema decipiens, Thalassionema manifesta, Thalassionema nativa
- Takarada and Muraoka (2004) Geology of the Hakkoda San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 86p. (in Japanese with English abstract 4p.)
- Muraoka and Hase (1990) Geology of the Kuroishi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 124p. (in Japanese with English abstract 8p.)