Geologic units in Sedgwick county, Kansas

Alluvium (Holocene to Pleistocene) at surface, covers 46 % of this area

unconsolidated sand, silt, clay, and gravel

Loess (Holocene to Pleistocene) at surface, covers 36 % of this area

eolian silts

Sumner Group (Late 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

Dune Sand (Holocene to Pleistocene) at surface, covers 0.2 % of this area

unconsolidated dune sand

Alluvium (Pleistocene) at surface, covers 0.1 % of this area

unconsolidated sand, silt, clay, and gravel