Fox Hills Formation
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.
| Fox Hills Formation | |
|---|---|
| Stratigraphic range: Late Cretaceous | |
A ridge capped by a sandstone bed of the Fox Hills Formation west of Limon, Colorado | |
| Type | Geological formation |
| Unit of | Montana Group (MT, ND) |
| Sub-units | Fairpoint member (SD), Trail City member (ND, SD), Timber Lake (ND, SD), Lincoln member (CO), etc. |
| Underlies | Lance (WY)/Hell Creek (MT) Laramie Formation (CO) |
| Overlies | Pierre (USA)/Bearpaw (CAN) Lewis Shale (WY, MT) |
| Thickness | 75-225 feet |
| Lithology | |
| Primary | Sandstone |
| Other | Shale |
| Location | |
| Region | Alberta, Colorado, Montana, North Dakota, South Dakota and Wyoming |
| Country | United States/Canada |
| Type section | |
| Named for | Fox Hills between Cheyenne and Moreau Rivers, South Dakota |
| Named by | Meek and Hayden |
| Year defined | 1862 |
Fossil remains of dinosaurs, including tyrannosaurs, as well as large marine reptiles, such as mosasaurs, have been recovered from the formation.
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