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Onbetsu Group
- Coherent formation
- Oligocene?
- Sedimentary facies: Marine
- Upper limit: Unconformity
- Lower limit: Conformity
- Onbetsu Group
- [ Upper ] Chokubetsu Formation
- ~~~~~~~~~~~~~~
- Nuibetsu Formation
- --------------
- Charo Formation
- ?--?--?--?--?-
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Urahoro city, Hokkaido
- Shimada et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.2, pp.81-85, DOI