# List of fossiliferous stratigraphic units in Colorado

This is a list of fossil-bearing stratigraphic units in the U.S. state of Colorado.

## Sites

| Group or formation | Period |
| Alamosa Formation | Pleistocene |
| Animas Formation | Paleogene, Cretaceous |
| Arapahoe Formation | Cretaceous |
| Battle Mountain Formation | Carboniferous |
| Belden Shale | Carboniferous |
| Browns Park Formation | Neogene |
| Brule Formation | Paleogene |
| Carline Shale | Cretaceous |
| Chadron Formation | Paleogene |
| Chinle Formation | Triassic |
| Chinle Group/Sheep Pen Sandstone | Triassic |
| Chinle Group/Sloan Canyon Formation | Triassic |
| Coalmont Formation | Paleogene |
| Colorado Group/Carlile Shale | Cretaceous |
| Colorado Group/Graneros Shale | Cretaceous |
| Colorado Group/Greenhorn Limestone | Cretaceous |
| Colorado Group/Niobrara Formation | Cretaceous |
| Creede Formation | Paleogene |
| Cuchara Formation | Paleogene |
| Cutler Formation | Permian |
| D Sandstone | Cretaceous |
| D1 Formation | Paleogene |
| Dakota Formation | Cretaceous |
| Dakota Group/Mesa Rica Sandstone | Cretaceous |
| Dakota Group/Muddy Sandstone | Cretaceous |
| Dakota Group/Pajarito Formation | Cretaceous |
| Dakota Group/Plainview Formation | Cretaceous |
| Dakota Group/South Platte Formation | Cretaceous |
| Dawson Formation | Paleogene |
| DeBeque Formation | Paleogene |
| Denver Formation | Paleogene, Cretaceous |
| Dotsero Formation | Cambrian |
| Dyer Formation | Devonian |
| Farisita Formation | Paleogene |
| Florissant Formation | Paleogene |
| Fort Union Formation | Paleogene |
| Fountain Formation | Carboniferous |
| Fox Hills Formation | Cretaceous |
| Fox Hills Sandstone | Cretaceous |
| Fremont Formation | Ordovician |
| Glen Canyon Group/Navajo Sandstone | Jurassic |
| Glen Canyon Group/Wingate Sandstone | Triassic |
| Green River Formation | Paleogene |
| Greenhorn Formation | Cretaceous |
| Greenhorn Limestone | Cretaceous |
| Harding Formation | Ordovician |
| Harding Sandstone | Ordovician |
| Huerfano Formation | Paleogene |
| Iles Formation | Cretaceous |
| Laramie Formation | Paleogene, Cretaceous |
| Leadville Limestone | Carboniferous |
| Lewis Shale | Cretaceous |
| Mancos Shale | Cretaceous |
| Manitou Limestone | Ordovician |
| Maroon Formation | Permian, Carboniferous |
| Martin Canyon Beds Formation | Neogene |
| McCoy Formation | Carboniferous |
| Mesaverde Formation | Paleogene, Cretaceous |
| Middle Park Formation | Paleogene |
| Minturn Formation | Carboniferous |
| Montana Group/Pierre Shale | Cretaceous |
| Morrison Formation | Jurassic |
| Niobrara Formation | Cretaceous |
| North Park Formation | Neogene |
| Ohio Creek Formation | Paleogene |
| Ouray Formation | Devonian |
| Paradox Formation | Carboniferous |
| Pawnee Creek Formation | Neogene |
| Pierre Shale | Cretaceous |
| Poison Canyon Formation | Paleogene |
| Priest Canyon Formation | Ordovician |
| Purgatoire Formation | Cretaceous |
| Raton Formation | Paleogene |
| Sangre de Cristo Formation | Carboniferous |
| Sawatch Formation | Cambrian |
| Shoshone? Formation | Paleogene |
| Split Rock Formation | Neogene |
| Summerville Formation | Jurassic |
| Troublesome Formation | Neogene |
| Vermejo Formation | Paleogene |
| Wasatch Formation | Paleogene |
| Washakie Formation | Paleogene |
| Weber Formation | Carboniferous |
| White River Formation | Paleogene |
| White River Group/Brule Formation | Paleogene |
| Williams Fork Formation | Cretaceous |