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Tsubusagawa Formation
- Coherent formation
- late Pliocene (3.5 Ma - ??? Ma, Pollen, Tephra)
- Tephra: Plioene (4.9 - 3.1 Ma, FT)
- Correlation: Tsuchishio Formation
- Sedimentary facies: Fluvial, Lacustrine
- Lithofacies (Upper): Coarse sandstone, Conglomerate
- Lithofacies (Middle): Tuffaceous mudstone
- Lithofacies (Lower): Coaly mudstone
- Thickness: 250 m
- Upper limit: Unknown
- Lower limit: Unknown
- [ Upper ] Higashishiiya Formation (2.4 Ma, Lava, K-Ar)
- ?--?--?--?--?-
- Tsubusagawa Formation
- ?--?--?--?--?-
- [ Lower ] Usa Formation (4.8 Ma, Lava, K-Ar)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Ajimu village - Innai village, Usa city, Oita pref.
- Fossils: Ajimu fauna
- Tephra: Mori-1Tephra (NKT-2), Mori-2 Tephra, Mori-3 Tephra, Mori-4 Tephra, Tanokuchi Tephra (NKT-13)
- Satoguchi (2016) Jour. Geol. Soc. Japan, vol.122, no.5, pp.223-229, DOI