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Kokubu Formation
- Sedimentary facies: Fluvial, Lacustrine
- Sedimentary facies (Minor): Marine
- Lithofacies (Upper): Clay, Silt, Sands, Gravels
- Lithofacies (Lower): Sands, Gravels
- Lithofacies (Lower, Minor): Clay, Silt
- Thickness: ca. 160 m
- Thickness (Upper): ca. 80 m
- Thickness (Lower): ca. 80 m
- Upper limit: Bottom of the sands and gravels bed below Ma 3
- Lower limit: Top of the silt bed including Mitsumatsu Tephra
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kashiigawa river, Izumisano city, Osaka pref.; Uchihata town, Kishiwada city, Osaka pref.; Matsuoji temple - Kamibessho - Nameri town, Izumi city, Osaka pref.
- Fossils: Elephas shigensis
- Tephra: Ss-Fkd, Kamifukuda, Senriyama, Yellow, Ryugaike, Kamamuro, Ss-Pnk, Komyoike, Yamada
- Key bed: Ma -1, Ma 0, Ma 1, Ma 2
- Miyachi et al. (1998) Geology of the Osaka-Tonambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 113p. (in Japanese with English abstract 5p.)
- Miyata et al. (1993) Geology of the Wakayama and Ozaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 68p. (in Japanese with English abstract 4p.)
- Itihara et al. (1986) Geology of the Kishiwada District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 148p. (in Japanese with English abstract 7p.)