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Nanko Formation
- Coherent formation
- Holocene, Last Glacial Period
- Sedimentary facies (Upper): Brackish
- Sedimentary facies (Lower): Freshwater
- Sedimentary facies (Upper): Tidal zone
- Sedimentary facies: Valley-fill deposit
- Paleo-river system: Paleo-Osakagawa river
- Lithofacies: Silt-bearing clay
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Nankoohashi bridge, Nanko, Osaka city, Osaka pref.
- Fossils: Plants (Phragmites australis), Trace fossils
- Fossils (Shellfishes): Brnea sp., Corbicula leana, Meretrix sp., Ruditapes sp.
- Huzita and Kasama (1982) Geology of the Osaka-Seihokubu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 8p.)