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The Fox Hills Formation is a Cretaceous geologic formation in the northwestern Great Plains of North America. It is present from Alberta on the north to Colorado in the south. Fossil remains of dinosaurs , including tyrannosaurs , as well as large marine reptiles, such as mosasaurs , have been recovered from the formation.
Fox Hills Formation was formed during the Paleogene / Cretaceous periods. It is a marginal marine yellow sandstone with shale interbeds [3] created with the receding Western Interior Seaway in Late Cretaceous time.
The Laramie Formation is exposed around the edges of the Denver Basin and ranges from 400–500 feet (120–150 m) on the western side of the basin, and 200–300 feet (60–90 m) thick on the eastern side. It rests conformably on the Fox Hills Sandstone and unconformably underlies the Arapahoe Conglomerate.
In 1862, F.B. Meek and F.V. Hayden described their “Upper Missouri River” series; Dakota, Benton, Pierre, Niobrara, and Fox Hills. [5]In 1871, Hayden crossed Kansas and Colorado on the recently completed Kansas Pacific Railway, and between Abilene and Limon confirmed the whole series within the two states.
Group or formation Period Notes Alamosa Formation: Pleistocene: Animas Formation: Paleogene, Cretaceous: Arapahoe Formation: Cretaceous: Battle Mountain Formation ...
Marine mollusks were preserved in the Fox Hills Formation. [16] Oysters and other mollusks were preserved in the sediments now composing the Dakota Formation. Aspects of the Coloradan flora were also preserved from this time. The most common plant fossils of the Dakota are the leaves of deciduous trees. Other contemporary plants included ferns ...
The Pierre is overlain by marginal marine deposits of the Fox Hills Formation. Most of the formation was deposited in the Campanian Age of the late Cretaceous. However, the discovery of fossils of Baculites baculus in the uppermost beds of the Pierre Shale in the Raton, New Mexico area show that deposition continued here into the early ...
Wyoming Minerals Corporation operated a pilot in-situ leaching plant from June 1977 to May 1978, successfully extracting uranium from a deposit in the Laramie Formation near the town of Grover. The aquifer was then remediated. [33] Power Resources Corporation began in-situ mining the uranium deposit in the Fox Hills Formation at Keota, Colorado ...