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Senpoku Formation
- Sedimentary facies: Fluvial, Lacustrine
- Sedimentary facies (Lower, Minor): Marine
- Lithofacies (Upper): Sands, Gravels
- Lithofacies (Upper, Minor): Silt, Clay
- Lithofacies (Lower): Sands, Gravels, Silt, Clay
- Thickness: ca. 90 m
- Thickness (Upper): ca. 50 m
- Thickness (Lower): ca. 40 m
- Lower limit: Bottom of the sands and gravels bed below Ma 3
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kogigawa river, Kaizuka city, Osaka pref.
- Fossils: Elephas shigensis
- Tephra: Ss-Az, Sayama, Imakuma, Hacchoike, Toga, Sakura, Mikita, Guminoki, Kasuri, Wada, Hatta
- Key bed: Ma 3, Ma 4, Ma 5, Ma 6, Ma 7, Ma 8, Ma 9, Ma 10
- Fossils (Plants): Pinus koraiensis
- 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.)