Laramie Formation | |
---|---|
Stratigraphic range: Maastrichtian, 69–68 Ma | |
Type | Geological formation |
Underlies | Arapahoe Formation |
Overlies | Fox Hills Formation |
Thickness | 200-400 ft (60-120 m) |
Lithology | |
Primary | Sandstone, mudstone, clay, coal[1] |
Location | |
Region | Colorado |
Country | United States |
Type section | |
Named by | Clarence King[2] |
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.[2] It was deposited on a coastal plain and in coastal swamps that flanked the Western Interior Seaway.[3] It contains coal, clay and uranium deposits, as well as plant and animal fossils, including dinosaur remains.[1]