Loose to well-cemented sand and gravel
Carlile Shale, Greenhorn Limestone, and Graneros Shale
Calcareous shale and limestone
Sandstone and shale
Includes dune sand and silt and Peoria Loess
Includes Piney Creek Alluvium and younger deposits
Includes Slocum, Verdos, Rocky Flats, and Nussbaum Alluviums in east, and Florida, Bridgetimber, and Bayfield Gravels in southwest
Includes Broadway and Louviers Alluviums
Morrison, Ralston Creek, and Entrada (or Exeter) Fms
Red sandstone, siltstone, and local limestone
Siltstone, dolomite, and sandstone; in southeast
unconsolidated dune sand
Intermediate to felsic compositions
unconsolidated sand, silt, clay, and gravel
Greenhorn FM- thin bedded gray, chalky limestone and calcareous shale. Graneros Shale- fissile, noncalcareous, gray shale locally contains sandstone and siltstone beds.
Chalky shale with bentonite and thick chalk beds, dark gray fissile shale containing septarian concretions, and fine-grained sandstone.