Fox Hills Formation

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Fox Hills Formation
Stratigraphic range: Late Cretaceous, Maastrichtian PreꞒ Ꞓ O S D C P T J K Pg N
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)^[1] Laramie Formation (CO)
Overlies	Pierre (USA)/Bearpaw (CAN)^[1] Lewis Shale (WY, MT)^[1]
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^[1]
Year defined	1862^[1]

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]

Lithology

The Fox Hills Formation consists of marginal marine yellow to grey sandstone with shale interbeds.^[1]^[3] It was deposited as a regressive sequence of barrier islands during the retreat of the Western Interior Seaway in Late Cretaceous time.^[4] In its eastern extents, the formation is underlain by the marine Pierre Shale in the United States and by the equivalent Bearpaw Formation in Canada, while in western ranges in Montana and Wyoming it overlies the Lewis Shale. The Fox Hills is overlain by continental sediments of the Laramie Formation in Colorado and the Lance Formation in Wyoming, the later being the equivalent of the overlying Hell Creek Formation in Montana.^[1]

References

^ ^a ^b ^c ^d ^e ^f ^g "Geologic Unit: Fox Hills". National Geologic Database. Geolex — Significant Publications. United States Geological Survey. Retrieved 2017-02-13.
^ Getman, Myron RC (1994). "Occurrences of Mosasaur and other reptilian fossil remains from the Fox Hills Formation (Maastrichtian: late Cretaceous) of North Dakota" (Document). St. Lawrence University Dept. of Geology theses.
^ Lexicon of Canadian Geologic Units. "Fox Hills Formation". Archived from the original on 2013-01-12. Retrieved 2010-02-01.
^ Henry W. Roehler (1993). "Stratigraphy of the Upper Cretaceous Fox Hills Sandstone and Adjacent Parts of the Lewis Shale and Lance Formation, East Flank of the Rock Springs Uplift, Southwest Wyoming". U.S. Geological Survey Professional Paper (1532). Washington: United States Government Printing Office.

v t e Aquifers
Canada	Arkell Spring Grounds Laurentian River System Oak Ridges Moraine
United States	Biscayne Aquifer Bishop Subbasin Buried Valley Aquifer System Edwards Aquifer Floridan aquifer Fox Hills Formation Kirkwood–Cohansey aquifer Mahomet Aquifer Ogallala Aquifer Permian Basin San Diego Formation Sankoty Aquifer Santa Clara valley aquifer Snake River Aquifer Southern Hills Aquifer Turlock Basin Wekepeke
Mexico	Lake Texcoco
South America	Guarani Aquifer Hamza River
Australia	Botany Sands Aquifer Gnangara Mound Great Artesian Basin Jandakot Mound Yarragadee Aquifer
New Zealand	Waiwhetu Aquifer
Africa	Bas Saharan Basin Lotikipi Basin Aquifer Nubian Sandstone Aquifer System
Middle-East	Yarkon-Taninim Aquifer
Europe	Alnarpsströmmen Schwyll Aquifer Upper Rhine Plain
Related articles	List of aquifers Aquifers in the United States Aquifer storage and recovery Aquifer test Artesian aquifer Sole Source Aquifer Surficial aquifer
Category

Chronostratigraphy of Colorado

Cenozoic chronostratigraphy of Colorado

Pleistocene	Alamosa Formation

Pliocene

Zanclean	Dry Union Formation Ogallala Formation

Miocene

Messinian	Dry Union Formation Ogallala Formation
Aquitanian	Arikaree Formation

Grouse Mountain Basalt

Oligocene

Chattian	Arikaree Formation

Eocene

Blanco Basin Formation

Green River Formation

Poison Canyon Formation

Uinta Formation

Wasatch Formation

Paleocene

Mesozoic chronostratigraphy of Colorado

Upper

Benton Formation

Carlile Shale

Castle Gate Formation

Cliff House Sandstone

Lion Canyon Formation

Pictured Cliffs Formation

Pierre Shale

Point Lookout Formation

Smoky Hill Chalk

Trinidad Formation

Vermejo Formation

Williams Fork Formation

Lower

Upper	Curtis Formation Morrison Formation Ralston Creek Formation Wanakah Formation
Middle	Carmel Formation Entrada Formation Garo Formation Page Formation Sundance Formation
Lower	Glen Canyon Formation Kayenta Formation Navajo Formation Wingate Sandstone

Upper

Chinle Formation

Middle

Anisian	Chugwater Formation

Lower

Olenekian	Chugwater Formation
Induan	Chugwater Formation Lykins Formation Taloga Formation

Moenkopi Formation

Paleozoic chronostratigraphy of Colorado

Lopingian

Changhsingian	Chugwater Formation Lykins Formation Taloga Formation

Cisuralian

Asselian	Fountain Formation Madera Formation

⁋

Gzhelian	Fountain Formation Madera Formation

Tournaisian	Williams Canyon Formation
Beulah Formation Gilman Formation Headscrabble Formation Leadville Formation Molas Formation Osage Formation Spergen Formation St. Louis Formation Ste. Genevieve Formation Warsaw Formation

Upper

Famennian	Williams Canyon Formation

Tremadocian	Dotsero Formation

Furongian

Stage 10	Dotsero Formation
Paibian	Lodore Formation Sawatch Formation

Series 3

Guzhangian	Lodore Formation Sawatch Formation

Precambrian chronostratigraphy of Colorado

pЄ

♇

Tonian	Uinta Mountain Group

Tava Formation

Siderian	Owiyukuts Complex

Uncompahgre Formation

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References