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Mineral Resources > Online Spatial Data > Geology > by state > Colorado

Colorado Group

Consists of Niobrara Formation (Kn) and either Benton Shale or Carlile, Greenhorn, and Graneros Fms (Kcg)
StateColorado
NameColorado Group
Geologic agePhanerozoic | Mesozoic | Cretaceous
Original map labelKc
Primary rock typeshale
Secondary rock typelimestone
Other rock types
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone
Sedimentary > Clastic > Mudstone > Shale
Map references
Tweto, Ogden 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.
Unit references
Tweto, Ogden 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.
Geographic coverageBoulder - Douglas - Eagle - Fremont - Grand - Jackson - Jefferson - Larimer - Park - Summit

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URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=COKc;0
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