InGen Database Description
The Laramie Formation is in north-eastern Colorado. It underlies the Arapahoe Formation and overlies the Fox Hills Formation. It was named by Clarence King in 1876 for exposures in north-eastern Colorado. The site dates to Maastrichtian stage of the Late Cretaceous epoch, 70 million years ago.
The formation consists of sandstone, mudstone and clay with the deposits from a coastal plain and swamps on the shore of the Western Interior Seaway. The lower member comprises of sandstone, clay and coal. The upper member features mudstone, sandstone and coal beds.
As well as numerous dinosaur finds, the site includes fish, plant, crocodile, turtle and mammal fossils. Significant plant finds have also been found here including fossil pollen for gymnosperms and angiosperm. The shale and sandstones also provide leaf fossils for angiosperms, ferns and palms. Conifer fossils are rare at this site.