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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.
The USGS convention has been to use Colorado Group where the rocks are further divided into formations, Colorado Formation where no beds are developed enough to be mapped as formations, and Colorado Shale where the unit is composed of little more than shale with no distinctive structures (such as in north-central Montana). [4]
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The White River Formation is found in the Northeastern corner of the Colorado, and was deposited between ~37.2 and ~30.8 Ma, encompassing parts of the late Eocene and early Oligocene. The formation is composed primarily of claystones , mudstones , and siltstones , within which a variety of fossil organisms, collectively referred to as the White ...
Colorado homes to be bulldozed after developers built on top of retention pond — families forced to sell everything and move. Chris Clark. September 30, 2024 at 4:48 AM
The Pierre Shale is about 3,138 feet (956m) thick at the type locality. It overlies the Niobrara division and underlies the Fox Hills beds. [1] It was named for an occurrence near Fort Pierre on the Missouri River in South Dakota. [3] The Pierre Shale is of marine origin and was deposited in the Western Interior Seaway.
Harding Sandstone; Stratigraphic range: Ordovician: Type: Formation: Underlies: Fremont Formation: Overlies: Manitou Limestone: Thickness: 26 to 46 m (85 to 151 ft ...