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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. [2]
A Late Cretaceous ammonite found in the Fox Hills Formation. Some of South Dakota's ammonites were very unusual for the group. [1]: 256 During the Late Cretaceous, the region now occupied by the Black Hills of South Dakota may have attracted long-necked plesiosaurs from hundreds of miles away as a source of gastroliths.
Group or Formation Period Notes Almond Formation: Cretaceous: ... Monroe Creek Formation: Paleogene: Montana Group/Fox Hills Formation: Cretaceous: Montana Group ...
Montana Group/Fox Hills Formation: Cretaceous: Montana Group/Hell Creek Formation: Cretaceous: Montana Group/Pierre Shale: Cretaceous: Morrison Formation: Jurassic:
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 ...
Cimarron Ridge Formation [12] US; Description Cokedale Formation [13] US; Description Crevasse Canyon Formation [14] US; Description Donoho Creek Formation [15] US; Description Eutaw Formation [16] US; Description Fox Hills Formation [17] US; Description Garita Creek Formation [18] US; Description Horsethief Sandstone [19] US; Description Iles ...
Part of the La Huérguina Formation: Pietraroja Plattenkalk. Albian Italy; Romualdo Formation. Early Albian Brazil; Known primarily for well-preserved pterosaur fossils, but also preserves dinosaurs like Irritator: Solnhofen limestone. Kimmeridgian [3] Germany [3] Origin of all specimens of Archaeopteryx; includes the Torleite Formation and the ...
The lignite and sandstone of the Fort Union Group in the west is the top groundwater unit and a common source of water for farms and ranches. The western two-thirds of the state is underlain by an extensive sandstone aquifer, mainly in the Fox Hills Formation and the lower Hell Creek Formation.