Laramie Formation
The Laramie Formation is a geologic formation of the Late Cretaceous (Maastrichtian) age, named by Clarence King in 1876 for exposures in northeastern Colorado, in the United States. It was deposited on a coastal plain and in coastal swamps that flanked the Western Interior Seaway. It contains coal, clay and uranium deposits, as well as plant and animal fossils, including dinosaur remains.
| Laramie Formation | |
|---|---|
| Stratigraphic range: Maastrichtian, 69–68 Ma | |
A typical outcrop of the Laramie Formation in northeastern Colorado. | |
| Type | Geological formation |
| Underlies | Arapahoe Formation |
| Overlies | Fox Hills Formation |
| Thickness | 200-400 ft (60-120 m) |
| Lithology | |
| Primary | Sandstone, mudstone, clay, coal |
| Location | |
| Region | Colorado |
| Country | United States |
| Type section | |
| Named by | Clarence King |
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