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Narusawa Formation (Yagi, 1942) Imanishi, 1950
- Type locality: Minamiukitamachi - Shichirinagahama seashore, Ajigasawa city, Nishitsugaru county, Aomori prefecture
- Coherent formation
- late Pliocene - early Pleistocene (3 - 2 Ma, Diatom)
- Sedimentary facies: Shallow marine (Shellfishes, Diatoms)
- Sedimentary facies: Regressive
- Lithofacies: Sandstone
- Lithofacies (Basal): Sandy siltstone, Muddy sandstone
- Lithofacies (Minor): Tuff, Siltstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Minamiukitamachi - Shichirinagahama seashore, Ajigasawa city, Nishitsugaru county, Aomori pref.
- Fossils: Diatoms, Sponges
- Fossils (Shellfishes): Acila nakazimai, Nuculana cf. sadoensis, Macoma nipponica, Dentalium weinkauffi, Limopsis sp., Pododesmus macroschisma, Septifer sp., Clinocardium cf. californiense, Ezocallista cf. brevisiphonata
- Fossils (Foraminifera): Cassidulina yabei, Uvigerina akitaensis, Angulogerina kokozuraensis, Buccella inusitata, Elphidium etigoense, Cassidulina subglobosa depressa, Pseudononion cf. japonicum, Elphidium clavatum, Cibicides lobatulus, Pullenia apertula, Bolivina decussata, Bolivina cf. robusta, Cassidulina japonica, Sigmomorphina sp., Fissurina marginata, Fissurina circulo-costa, Fissurina cf. formosana, Oolina melo, Astrnonion gallowayi, Elphidium sendaiense, Globigerina bulloides, Globigerina borealis, Globigerina quinqueloba, Globigerina japonica
- 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.)