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Geologic units in Bent county, Colorado

Additional scientific data in this geographic area

Dakota Sandstone and Purgatoire Fm (Cretaceous) at surface, covers 36 % of this area

Sandstone and shale

Carlile Shale, Greenhorn Limestone, and Graneros Shale (Cretaceous) at surface, covers 29 % of this area

Carlile Shale, Greenhorn Limestone, and Graneros Shale

Niobrara Fm (Cretaceous) at surface, covers 14 % of this area

Calcareous shale and limestone

Eolian deposits (Quaternary) at surface, covers 8 % of this area

Includes dune sand and silt and Peoria Loess

Morrison, Ralston Creek, and Entrada (or Exeter) Fms (Jurassic) at surface, covers 5 % of this area

Morrison, Ralston Creek, and Entrada (or Exeter) Fms

Modern alluvium (Quaternary) at surface, covers 3 % of this area

Includes Piney Creek Alluvium and younger deposits

Gravels and alluviums (Quaternary) at surface, covers 2 % of this area

Includes Broadway and Louviers Alluviums

Ogallala Fm (Tertiary) at surface, covers 2 % of this area

Loose to well-cemented sand and gravel

Older gravels and alluviums (Quaternary) at surface, covers 0.6 % of this area

Includes Slocum, Verdos, Rocky Flats, and Nussbaum Alluviums in east, and Florida, Bridgetimber, and Bayfield Gravels in southwest