Geologic units in Edwards county, Kansas

Additional scientific data in this geographic area

Dune Sand (Holocene to Pleistocene) at surface, covers 65 % of this area

unconsolidated dune sand

Loess (Holocene to Pleistocene) at surface, covers 20 % of this area

eolian silts

Alluvium (Holocene to Pleistocene) at surface, covers 12 % of this area

unconsolidated sand, silt, clay, and gravel

Ogallala Formation (Miocene) at surface, covers 2 % 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 (Pleistocene) at surface, covers 0.3 % of this area

unconsolidated sand, silt, clay, and gravel

Greenhorn Limestone and Graneros Shale (Late Cretaceous) at surface, covers 0.3 % of this area

Greenhorn FM- thin bedded gray, chalky limestone and calcareous shale. Graneros Shale- fissile, noncalcareous, gray shale locally contains sandstone and siltstone beds.