Stratigraphic range: Late Pennsylvanian
Red rocks typical of The Fountain Formation seen at Roxborough State Park near Littleton, Colorado
|Named for||Fountain Creek|
|Named by||C. W. Cross, 1894|
The Fountain Formation is a Pennsylvanian bedrock unit consisting primarily of conglomerate, sandstone, or arkose, in the states of Colorado and Wyoming in the USA, along the east side of the Front Range of the Rocky Mountains, and along the west edge of the Denver Basin.
Origin of name
- 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
Marine invertebrates have been discovered in a limestone and shale member of the Fountain Formation, outcropping 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 Cañon 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 296 million years old.
- Frederickson, E.A., De Lay, M., and Saylor, W.W., 1956, Ralston formation of Canon City embayment, Colorado: American Association of Petroleum Geologists Bulletin, v. 40, no. 9, p. 2120-2148.
- Cross, C.W., 1894, Description of the Pikes Peak sheet [Colorado]: U.S. Geological Survey Geologic Atlas of the United States, Pikes Peak folio, no. 7, 5 p.
- Ellis, C.H., 1966, Paleontologic age of the Fountain Formation south of Denver, Colorado: The Mountain Geologist, v. 3, no. 4, p. 155-160.
- Jennings, J.R., 1980, Fossil plants from the Fountain Formation (Pennsylvanian) of Colorado: Journal of Paleontology, v. 54, no. 1, p. 149-158.
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