| Fountain Formation | |
|---|---|
| Stratigraphic range: Late Pennsylvanian | |
 Outcrop of the Fountain Formation at Garden of the Gods. Scale bar on notebook is 10 centimetres (3.9 in) | |
| Type | sedimentary |
| Underlies | Lyons Formation |
| Overlies | Gleneyrie Formation |
| Thickness | 0–4,500 feet (0–1,372 m)[1] |
| Lithology | |
| Primary | sandstone, conglomerate |
| Other | limestone, shale |
| Location | |
| Region | Denver Basin |
| Extent | Colorado, Wyoming |
| Type section | |
| 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 United States, along the east side of the Front Range of the Rocky Mountains, and along the west edge of the Denver Basin.
- ^ 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.