The Laramie formation is a geological unit in the northeastern part of Colorado that was deposited during the late Cretaceous period on a coastal plain and swamp region in the Western Interior Seaway. The formation includes uranium deposits, and fossils of plants, animals, and dinosaurs. The lower member of the formation is composed of sandstone, clay, and coal, and the upper member is composed of mudstone and lesser amounts of coal and sandstone.

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