[ Top ] [ Japanese ]

Nanko Formation

• Coherent formation
• Holocene, Last Glacial Period
• Middle: Holocene (10,200, 9,600 yBP, ¹⁴C)
• Lower: Holocene (9,790, 9,720 yBP, ¹⁴C)

• Sedimentary facies (Upper): Brackish
• Sedimentary facies (Lower): Freshwater
• Sedimentary facies: Inner bay
• Sedimentary facies (Upper): Tidal zone
• Sedimentary facies: Valley-fill deposit
• Paleo-river system: Paleo-Osakagawa river
• Lithofacies (Upper): Sands
• Lithofacies (Upper, Minor): Peat
• Lithofacies (Middle): Clay
• Lithofacies (Lower): Silt-bearing clay
• Sedimentary structures (Lower): Parallel stratification

• Thickness: ca. 7 - 10 m
• Thickness (Lower): 1.2 m
• Thickness (Middle): 1.3 m
• Thickness (Lower): 4.5 m
• Lower limit: Unconformity (Itami Formation)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Nankoohashi bridge, Nanko, Osaka city, Osaka pref.
• Fossils: Plants (Phragmites australis), DiatomsTrace fossils
• Fossils (Shellfishes): Barnea manilensis, Corbicula leana, Meretrix sp., Ruditapes sp.
• Tephra: Oki

• Huzita and Maeda (1985) Geology of the Osaka-Seinambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 5p.)
• 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.)