Geologic units in Sedgwick county, Kansas

Alluvium (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 46 % of this area: unconsolidated sand, silt, clay, and gravel
Lithology: gravel; sand; silt; clay or mud
Loess (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 36 % of this area: eolian silts
Lithology: silt
Dune Sand (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 0.2 % of this area: unconsolidated dune sand
Lithology: sand
Alluvium (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers 0.1 % of this area: unconsolidated sand, silt, clay, and gravel
Lithology: gravel; sand; silt; clay or mud
Sumner Group (Phanerozoic | Paleozoic | Permian [Cimarronian]) at surface, covers 18 % of this area: Ninnescah Shale (base N)- mostly red silty shale with some gray shale , argillaceous limestone and dolomite. Wellington FM with Carlton Limestone Member (base CR)-mostly gray and some red shale with minor limestone and dolomite, siltstone, gypsum and anhydrite
Lithology: shale; limestone; siltstone; dolostone (dolomite); evaporite