Geologic units in Scott county, Kansas

Loess (Holocene to Pleistocene) at surface, covers 89 % of this area

eolian silts

Ogallala Formation (Miocene) at surface, covers 5 % of this area

massive to cross-bedded, generally arkosic sand, silt and gravel, locally cemented with calcium carbonate; also contains limestone, volcanic ash, diatomaceous marl, opaline sandstone and bentonitic clay

Dune Sand (Holocene to Pleistocene) at surface, covers 3 % of this area

unconsolidated dune sand

Alluvium (Holocene to Pleistocene) at surface, covers 2 % of this area

unconsolidated sand, silt, clay, and gravel

Niobrara Chalk (Late Cretaceous) at surface, covers 0.9 % of this area

Interbedded, soft, light-gray calcareous shale and chalk