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Ukekoi Formation
- Coherent formation
- Foreland basins by collision between northeast Japan island arc and Kuril island arc
- middle Miocene (Diatoms)
- Sedimentary facies: upper - middle Submarine fan
- Sedimentary facies: Channel-fill, Levee
- Sedimentary facies: Turbidite
- Lithofacies: Sandy turbidite
- Lithofacies: Sandstone, Conglomerate, Mudstone
- Sedimentary structures: Cross stratification, Graded bedding, Reversed graded bedding
- Paleocurrent: South
- Hidaka basin, northeast
- [ Upper ]
- ?--?--?--?--?-
- Niniu Group
- ?--?--?--?--?-
- [ Lower ]
- Hidaka basin, southwest
- [ Upper ]
- ?--?--?--?--?-
- Fureoi Formation
- ?--?--?--?--?-
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Hae river, Monbetsu, Hidaka city, Saru county, Hokkaido; Kishimatsu river, Kabari, Hidaka city, Saru county, Hokkaido; Ukekoi river, Niikappu city, Niikappu county, Hokkaido
- Kase et al., (2018) Jour. Geol. Soc. Japan, vol.124, no.8, pp.627-642 DOI