Trisha Shetty (Editor)

Fountain Formation

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Type  sedimentary
Thickness  0-4500 ft
Extent  Colorado, Wyoming
Region  Denver Basin
Underlies  Lyons Formation
Overlies  Gleneyrie Formation
Other  limestone, shale
Named by  C. W. Cross, 1894
Named for  Fountain Creek
Primary  Sandstone, Conglomerate
Fountain Formation Roxborough State Park Fountain Valley Loop Colorado Lifestyle

Hiking red rocks the fountain formation of the colorado front range

The Fountain Formation is a Pennsylvanian bedrock unit consisting primarily of conglomerate, sandstone, or arkose, in the states of Colorado and Wyoming in the United States, along the east side of the Front Range of the Rocky Mountains, and along the west edge of the Denver Basin.


Fountain Formation A Walk Through Time Undergraduate Scientists

The greatest fountain formation ever

Origin of name

Fountain Formation Cochise College P

The Fountain Formation was named by geologist W. C. Cross in 1894 for exposures along Fountain Creek in El Paso County, Colorado.


The Fountain unconformably overlies Precambrian granite and gneiss. Outcrops of the formation typically dip steeply to the east.

Depositional environment

Fountain Formation Fountain Formation vs Precambrian Gneiss Photos Diagrams amp Topos

The formation was formed by the erosion of the Ancestral Rocky Mountains, and deposition by fluvial processes as alluvial fans.

Fountain Formation Geology of Colorado Boulder Valley Field Trip 1 Stop 1

The characteristic predominant red color and the composition of the Fountain reflect that of the granites and gneisses from which it was eroded.

Notable Exposures

  • Flatirons, near Boulder, Colorado
  • Red Rocks Park and Amphitheater, Golden, Colorado
  • Roxborough State Park, south of Denver, Colorado
  • Garden of the Gods in Colorado Springs, Colorado
  • Red Rock Canyon Open Space in Colorado Springs, Colorado
  • Fossils

    Marine invertebrates have been discovered in a limestone and shale member of the Fountain Formation, cropping out on a low hogback in Perry Park. Invertebrates include bryozoans, brachiopods, crinoids, echinoids, and gastropods.

    Plant fossils have been discovered in Garden Park north of CaƱon City, including Lepidophloios laricinus, Sigillaria, Syringodendron sp., Lepidophyloides sp., Lepidostrobus sp., Lepidostrobophyllum sp., Calamites, Neuropterus sp., Cyclopteris sp., and Stigmaria ficoides.


    Rocks of the Fountain Formation are considered to be of Late Pennsylvanian age, and are between 290 and 340 million years old.


    Fountain Formation Wikipedia

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