Geologic units in Grant county, Kansas

Loess (Holocene to Pleistocene) at surface, covers 85 % of this area

eolian silts

Alluvium (Pleistocene) at surface, covers 11 % of this area

unconsolidated sand, silt, clay, and gravel

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

unconsolidated dune sand

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

unconsolidated sand, silt, clay, and gravel