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Daijima Formation Toyama, 1925

Invalid synonym: Kohama Sandstone, Kanegasaki Tuff, Nakayamatoge Sandstone and Conglomerate Member, Tsubaki Sandstone and Conglomerate Member

It had been defined to include lower beds corresponding to Nomuragawa Formation.

• Type locality: Tsubaki - Daijima, Funagawaminato, Oga city, Akita prefecture
• Volcanic rocks
• early Miocene (20.1 Ma, FT)
• Correlation: Kuroishizawa Formation, Hayaguchigawa Formation, Hatamura Formation, Kanotsume Formation, Yashiozawakawa Formation, Daisenyama Formation, Okura Formation, Tanashigawa Member

• Sedimentary facies: non-Marine
• Sedimentary facies: Delta
• Sedimentary facies: Hyperconcentrated flow, Lahar
• Lithofacies: Siltstone, Mudstone, Sandstone, Conglomerate
• Sedimentary structures: Channel structure, Trough cross-stratification, Parallel stratificaiton

• Thickness: ca. 150 m
• Upper limit: Unconformity (Nishikurosawa Formation, Onnagawa Formation)
• Lower limit: Onlap unconformity (Nomuragawa Dacite I, Nomuragawa Basalt), Unconformity (Shiosenomisaki Sandstone and Conglomerate, Tateyamazaki Dacite)

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

• Distribution: 100 - 400 m above sea level of Sugoroku river - Daijima - Tsubaki, Funagawaminato, Oga city, Akita pref.; Shinan - Honzan - Mount Kenashi, Oga city, Akita pref.; Cape Tateyamazaki - Cape Shiose, Oga city, Akita pref.
• Fossils (Daijima flora): Acer sp., Alangium aequalifolium, Alnus miojaponica, Buxus protojaponica, Camellia protojaponica, Carpinus heigunensis, Carpolithes japonica, Carya sp., Castanopsis miocuspidata, Cinnamonum lanceolatum, Cinnamonum miocenum, Comptonia naumanni, Cyclobalanopsis mandraliscae, Cyclobalanopsis nathorstii, Cyclocarya ezoana, Decodon sp., Dryopteris uttoensis, Elaeagnus mikii, Entada mioformosana, Gleditsia miosinensis, Glyptostrobus europaeus, Hemitrapa yokoyamae, Ilex daijimaensis, Ilex ohashii, Keteleeria ezoana, Lindera gaudini, Liquidambar miosinica, Machilus nathorstii, Machilus ugoana, Metasequoia occidentalis, Paliurus miosinicus, Parabenzoin protopraecox, Parrotia pristine, Pasania sp., Picea ugoana, Pinus miocenica, Podogonium knorrii, Quercus miovariabilis, Salix sp., Sapindus tanaii, Smilax trinervis, Spiraea sp., Ternstroemia maekawai, Ulmus longifolia, Ulmus subparvifolia, Zelkova ungeri

• Kano (2018) Jour. Geol. Soc. Japan, vol.124, no.10, pp.781-803 DOI
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• Kobayashi et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.10, pp.552-562 DOI
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