Geologic units in Greeley county, Kansas

Loess (Holocene to Pleistocene) at surface, covers 92 % of this area

eolian silts

Ogallala Formation (Miocene) at surface, covers 8 % 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

Alluvium (Holocene to Pleistocene) at surface, covers 0.8 % of this area

unconsolidated sand, silt, clay, and gravel

Dune Sand (Holocene to Pleistocene) at surface, covers < 0.1 % of this area

unconsolidated dune sand

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

Includes dune sand and silt and Peoria Loess

Ogallala Fm (Tertiary) at surface, covers < 0.1 % of this area

Loose to well-cemented sand and gravel

Niobrara Fm (Cretaceous) at surface, covers < 0.1 % of this area

Calcareous shale and limestone