Geologic units in Stanton county, Kansas

Loess (Holocene to Pleistocene) at surface, covers 88 % of this area

eolian silts

Dune Sand (Holocene to Pleistocene) at surface, covers 8 % of this area

unconsolidated dune sand

Ogallala Formation (Miocene) at surface, covers 4 % 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

Dakota Formation (Early Cretaceous) at surface, covers 0.5 % of this area

White, gray, red, brown and tan kaolinitic claystone, mudstone, shale and siltstone interbedded with grayish to yellowish brown thick lenticular sandstone beds. It also contains lignite and sandstone is commonly well cemented with iron oxide and calcite.

Ogallala Fm (Tertiary) at surface, covers 0.2 % of this area

Loose to well-cemented sand and gravel

Dakota Sandstone and Purgatoire Fm (Cretaceous) at surface, covers < 0.1 % of this area

Sandstone and shale

Eolian deposits (Quaternary) at surface, covers < 0.1 % of this area

Includes dune sand and silt and Peoria Loess