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The Fountain Formation is a conglomerate sandstone or arkose, red or reddish-gray in color, that is found in various locations in the state of Coloradomarker in the USAmarker, along the east side of the Front Range of the Rocky Mountains, along the west edge of the Denver Basin. Especially notable examples of this formation are the Flatironsmarker, the Garden of the Godsmarker, Roxborough State Parkmarker, and Red Rocksmarker Park and Amphitheater.

Origin of name

The Fountain Formation is named for the city of Fountain, Coloradomarker in El Paso Countymarker, where an exemplary example of this formation may be found.


Rocks of the Fountain Formation are considered to be of Pennsylvanian age, and are between 290 and 296 million years old. They were formed by the erosion of the Ancestral Rocky Mountains, and their color and composition reflects those of the granites and gneisses from which they were eroded.


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