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Mai‚”o Formation (Yagi, 1942) Imanishi, 1950
- Sedimentary facies: Marine
- Sedimentary facies: Submarine pyroclastic flow
- Sedimentary facies (Top): Turbidite
- Sedimentary facies (Top): Regressive
- Lithofacies (Top): Interbedded sandstone and siltstone
- Lithofacies: Diatomaceous siltstone
- Lithofacies (Minor): Acidic tuff
- Sedimentary structures (Top): Graded bedding
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Maitomachi, Ajigasawa city, Nishitsugaru county, Aomori pref.; Akaishi river - Nakamura river, Ajigasawa city, Nishitsugaru county, Kodoji river, Fukaura city, Nishitsugaru county, Aomori pref.
- Fossils: Sponges (Sagarites chitanii = Makiyama chitanii)
- Fossils (Shellfishes): Pectinidae, Yoldia sp., Nuculana sp., Conchocele sp., Astarte sp., Cardium sp., Turritella saishuensis, Natica sp., Nassarius sp.
- Fossils (Foraminifera): Nonion nicobarense, Nonion pompilioides, Bolivinita quadrilatea, Uvigerina akitaensis, Eponides cf. haidingerii, Cassidulina laevigata, Globobulimina auriculata, Pullenia apertula, Bulimina utriata, Eponides umbanatus, Hoglundina elegans, Ellipsonodosaria ketienziensis, Dentalina subsoluta, Frondicularia cf. goharai, Planulina nipponica, Pyrgo murrhina, Siphotextularia saulcyana, Sphaeroidina austriaca, Nodosaria iongiscata, Nodosaria tosta, Ehrenbergina cf. notoensis, Martinottiella communis, Bolivina marginata, Lagena laevis, Globigerina borealis, Globigerinita kiwadaensis, Globigerina bulloides, Globigerina japonica, Globigerina quinqueloba, Cassidulina setanaensis, Guttulina yabei, Quinqueloculina vulgaris, Quinqueloculina seminula, Uvigerina akitaensis, Cibicides iobatulus, Karreriella baccata, Pyrgo ezoa, Pyrgo vespertilio, Miliolinella circularis, Guttulina sadoensis, Spiroplectammina, Textularia cf. fistula, Rotalia japonica, Triloculina trigonura, Triloculina rotunda, Quinqueloculina akneriana, Quinqueloculina sawanensis, Nonion pacificum, Sigmomorphina ozawai, Sigmomorphina trilocularis, Elphidium fax, Elphidium advenum, Cibicides aknerianus, Poroeponides cribrorepandus, Quinqueloculina contorta, Sigmoilina sigmoidea, Eponides nipponicus, Globigerina cf. diplostoma, Globigerina japonica
- Fossils (Diatoms): Achnanthes sp., Actinocyclus curvalulus, Actinocyclus ingens, Actinocyclus cfr. oculatus, Actinocyclus octonarius, Actinocyclus cfr. ocholensis, Actinoptychus senarius, Actinoptychus splendens, Actinoptychus vulgaris, Arachnoidiscus sp., Asteromphalus spp., Auliscus sp., Aulacodiscus sp., Aulacasira granulata, Bacteriastrum sp., Biddulphia rhombus, Biddulphia tuemeyi, Clavicula polymorpha, Cocconeis californica, Cocconeis costata, Cocconeis decipiens, Cocconeis kamtschatkiensis, Cocconeis pinnala, Cocconeis scutellum, Cocconeis vitrea, Cocconeis spp., Coscinodiscus argus, Coscinodiscus marginatus, Coscinodiscus nodulifer, Coscinodiscus sp. A cfr. nodulifer, Coscinodiscus oculus-iridus, Coscinodiscus aff. obscurus, Coscinodiscus symbolupharus, Coscinodiscus temperei, Coscinodiscus yabei, Coscinodiscus spp., Cyclotella comla, Cyclotella striata, Cyclotella spp., Cymatosira debyi, Denticulopsis dimorpha, Denticulopsis hyalina, Denticulopsis hustedtii, Denticulopsis kamtschatica, Denticulopsis lauta, Denticulopsis praedimorpha, Denticulopsis seminae v. fossilis, Delphineis surirella, Delphineis spp., Detonula pumila, Diploneis bombus, Diploneis cfr. bombus, Diploneis smithii, Epithemia sp., Eunotia sp., Grammatophora spp., Hemidiscus cuneiformis, Hyalodiscus ukaiensis, Hyalodiscus absoletus, Hyalodiscus spp., Licmophora sp., Melosira sol, Melosira sp., Navicula spp., Nitzschia pliocena, Nitzschia cfr. extincta, Nitzschia spp., Odontella aurita, Paralia sulcata, Plagiogramma staurophorum, Porosira glacialis, Pseudapodosira elegans, Pseudapodosira sp., Pterotheca sp., Rhabdonema japonicum, Rhaphoneis amphiceras, Rhaphoneis nitida, Rhizosolenia barboi, Rhizosolenia spp., Roicosphenia sp., Rossiella cfr. tatsunokuchiensis, Rouxia californica, Rutilaria epsilon, Stephanogoia spp., Stephanodiscus spp., Thalassionema hirosakiensis, Thalassionema schraderi, Thalassionema nitzschioides, Thalasiosira antiquaThalasiosira convexa, Thalasiosira gravida, Thalasiosira hyalina, Thalasiosira cfr. kryophila, Thalasiosira jaksonii, Thalasiosira leptopus, Thalasiosira lineata, Thalasiosira nidulus, Thalasiosira nordenskioeldii, Thalasiosira oestrupii, Thalassiosira punctata, Thalasiosira zabelinae, Thalasiosira sp., Thalassiothrix longissima, Triceratium antediluvianum, Triceratium arcticum, Triceratium cfr. arcticum, Tracyneis aspera
- Sakai et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.4, pp.297-305 DOI
- Hirayama and Uemura (1985) Geology of the Ajigasawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 86p. (in Japanese with English abstract 6p.)
- Ozawa and Hirayama (1970) Geology of the Goshogawara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 25p. (in Japanese with English abstract 3p.)