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Ichinose Formation (Morishima, 1941) Yanagisawa et al., 2000
Invalid synonym: Ohira Formation, Hiramaru Formation, Kamikozawa Formation
- Type locality: Ichinose bridge, Takinowaki, Tomikura, Iiyama city, Nagano prefecture
- Coherent formation
- Nagasawa trough and Tomikura trough-fill deposits
- early - late Pliocene
- Contemporaneous heterotopic facies (Lower): Tomikura Formation
- Correlation: Nishiyama Formation
- Intruded by: Andesite dikes
- Sedimentary facies: Marine
- Sedimentary facies: Trough-fill turbidite
- Sedimentary facies: Channel trough-fill deposits, Levee-overflow deposits, Sheet flow deposits
- Depth of water: Lower Littoral
- Lithofacies: Interbedded sandstone and mudstone, Sandstone, Conglomerate
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Takinowaki - Nigoriike, Tomikura, Iiyama city, Nagano pref.; Ohira, Iiyama city, Nagano pref.; Okuma river, Itakura ward, Joetsu city, Niigata pref.; Kamihiramaru - Tarumoto - Nagasawa - Baba river, Myoko city, Niigata pref.
- Fossils: Foraminifera
- Fossils (Omma-Manganji fauna): Shellfishes
- Tephra: Kamisekida Tuff
- Yanagisawa et al. (2000) Geology of the Iiyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 144p. (in Japanese with English abstract 6p.)